Swiper JS Slider next/previous buttons aren’t working perfectly

Hi guys I’m having a bit of trouble using swiper js slides. This is the link of my website having swiper js slider:
https://nyside2.internet.dk/
As you can see in the start the swiper js slider is showing a few parts from the next slide. This is a very big concern for me. Because I want only one slider per view also when I click on the next or previous button I’m having half part of the previous slider and half part of the next slider at the same time. Again this isn’t what I want I want only one slide after clicking the next or previous button.
You can see the code below that I’m using:

<HTML>
<head>
<style>
HTML,body
{position: relative;
  height: 100%;
}
body{
  font-family: Helvetica Neue, Helvetica, Arial, sans-serif;
  font-size: 14px;
  color:#000;
  margin: 0;
  padding: 0;
}
#Slider .swiper-container {
  width: auto;
  height: 100%;
}
#Slider .swiper-slide {
  text-align: center;
  font-size: 18px;
  background: #fff;
  /* Center slide text vertically */
  display: flex;
  justify-content: center;
  align-items: center;
}

/* reset list */
#Slider ul.swiper-wrapper{
  list-style-type: none;
  padding: 0px;
  margin: 0px;
}

#Slider h2{
  flex-basis: 100%;
}


#Slider .swiper-button-prev,
#Slider .swiper-button-next{
 top: 45%;
 background: none;
 color: #FFFFFF;
 opacity: 0;
}

#Slider .swiper-container:hover .swiper-button-prev{
    opacity: 1.0;
    animation-duration: 1s;
    animation-iteration-count: 1;
    margin-left: 30px;
    animation-name: PreviousSlider;
}

u/keyframes PreviousSlider{
    0%{
    opacity: 1;
    }
    100%{
    opacity: 1;
    transform: translate(30px, 0px);
    }
}


#Slider .swiper-container:hover .swiper-button-next{
    opacity: 1.0;
    animation-duration: 1s;
    animation-iteration-count: 1;
    margin-right: 30px;
    animation-name: NextSlider;
}


u/keyframes NextSlider{
  0%{
    opacity: 1;}
  100%{
    opacity: 1;
    transform: translate(-30px, 0px);}
}

#Slider .h2--small .heading-line--0{
    position: absolute;
    display: block;
    top: 50%;
    margin-left: 20px;
    z-index: 11;
    font-family: futura-pt;
    font-style: Regular;
    text-transform: uppercase;
    height: auto;
    color: rgb(255, 255, 255);
    text-decoration: none;
    white-space: normal;
    width: 894px;
    min-height: 0px;
    min-width: 0px;
    max-height: none;
    max-width: none;
    text-align: left;
    line-height: 75px;
    letter-spacing: normal;
    font-size: 60px;
    font-weight: 200;
    transform-origin: 50% 50%;
    opacity: 1;
    transform: translate(0px, 0px);
    visibility: visible;
}

#Slider .h2--small .heading-line--1{
    position: absolute;
    display: block;
    top: 58%;
    margin-left: 20px;
    z-index: 11;
    font-family: futura-pt;
    font-style: Regular;
    text-transform: uppercase;
    height: auto;
    color: rgb(255, 255, 255);
    text-decoration: none;
    white-space: normal;
    width: 894px;
    min-height: 0px;
    min-width: 0px;
    max-height: none;
    max-width: none;
    text-align: left;
    line-height: 75px;
    letter-spacing: normal;
    font-size: 60px;
    font-weight: 500;
    transform-origin: 50% 50%;
    opacity: 1;
    transform: translate(0px, 0px);
    visibility: visible;
} 

#Slider .content_subtitle{
    position: absolute;
    display: block;
    top: 68%;
    margin-left: 20px;
    z-index: 9;
    font-family: futura-pt;
    color: rgb(255, 255, 255);
    text-decoration: none;
    white-space: normal;
    width: 579px;
    height: 87px;
    min-height: 0px;
    min-width: 0px;
    max-height: none;
    max-width: none;
    text-align: left;
    line-height: 29px;
    letter-spacing: 0px;
    font-weight: 400;
    font-size: 24px;
    transform-origin: 50% 50%;
    opacity: 1;
    transform: translate(0px, 0px);
    visibility: visible;
}

#Slider .button--inline{
    position: absolute;
    display: block;
    top: 77%;
    margin-left: 20px;
    z-index: 8;
    background-color: rgba(0, 0, 0, 0);
    font-family: "News Cycle";
    text-transform: uppercase;
    height: auto;
    width: auto;
    color: rgb(255, 255, 255);
    text-decoration: none;
    white-space: nowrap;
    min-height: 0px;
    min-width: 0px;
    max-height: none;
    max-width: none;
    text-align: left;
    line-height: 23px;
    letter-spacing: 2px;
    font-weight: 700;
    font-size: 20px;
    transform-origin: 50% 50%;
    opacity: 1;
    transform: translate(0px, 0px);
    visibility: visible;
    border-width: 0px;
    border-radius: 0px;
}

#Slider .button--inline .b8{
    color: #EF8524;
}

#Slider .fa-long-arrow-alt-right:before{
    color: #EF8524;
    text-align: left;
    letter-spacing: 0px;
    font-weight: 400;
}

#Slider .video-overlay{
    margin-top: -759px;
    width: 100%;
    height: 750px;
    position: relative;
    display: flex;
    background: black;
    opacity: 0.5;
}

/* Extra small devices (phones, 600px and down) */
u/media only screen and (max-width: 600px) and (min-width: 360px){
#Slider .swiper-button-prev,
#Slider .swiper-button-next{
display: none;
}

#Slider .h2--small .heading-line--0{
    position: absolute;
    display: block;
    top: 22%;
    margin-left: 20px;
    z-index: 11;
    font-family: futura-pt;
    font-style: Regular;
    text-transform: uppercase;
    height: auto;
    color: rgb(255, 255, 255);
    text-decoration: none;
    white-space: normal;
    width: 894px;
    min-height: 0px;
    min-width: 0px;
    max-height: none;
    max-width: none;
    text-align: left;
    line-height: 75px;
    letter-spacing: normal;
    font-size: 25px;
    font-weight: 200;
    transform-origin: 50% 50%;
    opacity: 1;
    transform: translate(0px, 0px);
    visibility: visible;
}    

#Slider .h2--small .heading-line--1{
    position: absolute;
    display: block;
    top: 33%;
    margin-left: 20px;
    z-index: 11;
    font-family: futura-pt;
    font-style: Regular;
    text-transform: uppercase;
    height: auto;
    color: rgb(255, 255, 255);
    text-decoration: none;
    white-space: normal;
    width: 894px;
    min-height: 0px;
    min-width: 0px;
    max-height: none;
    max-width: none;
    text-align: left;
    line-height: 75px;
    letter-spacing: normal;
    font-size: 25px;
    font-weight: 500;
    transform-origin: 50% 50%;
    opacity: 1;
    transform: translate(0px, 0px);
    visibility: visible;
}

#Slider .content_subtitle{
    position: absolute;
    display: block;
    top: 53%;
    margin-left: 20px;
    z-index: 9;
    font-family: futura-pt;
    color: rgb(255, 255, 255);
    text-decoration: none;
    white-space: normal;
    width: 320px;
    height: 87px;
    min-height: 0px;
    min-width: 0px;
    max-height: none;
    max-width: none;
    text-align: left;
    line-height: 25px;
    letter-spacing: 0px;
    font-weight: 400;
    font-size: 18px;
    transform-origin: 50% 50%;
    opacity: 1;
    transform: translate(0px, 0px);
    visibility: visible;
}

#Slider .button--inline{
    position: absolute;
    display: block;
    top: 84%;
    margin-left: 20px;
    z-index: 8;
    background-color: rgba(0, 0, 0, 0);
    font-family: "News Cycle";
    text-transform: uppercase;
    height: auto;
    width: auto;
    color: rgb(255, 255, 255);
    text-decoration: none;
    white-space: nowrap;
    min-height: 0px;
    min-width: 0px;
    max-height: none;
    max-width: none;
    text-align: left;
    line-height: 23px;
    letter-spacing: 2px;
    font-weight: 700;
    font-size: 18px;
    transform-origin: 50% 50%;
    opacity: 1;
    transform: translate(0px, 0px);
    visibility: visible;
    border-width: 0px;
    border-radius: 0px;
}
}


/***********


/* Small devices (portrait tablets and large phones, 600px and up) */
u/media only screen and (max-width: 768px) and (min-width: 600px){
#Slider .swiper-button-prev,
#Slider .swiper-button-next{
 top: 35%;
 background: none;
 color: #FFFFFF;
 opacity: 0;
}

#Slider .h2--small .heading-line--0{
    position: absolute;
    display: block;
    top: 40%;
    margin-left: 20px;
    z-index: 11;
    font-family: futura-pt;
    font-style: Regular;
    text-transform: uppercase;
    height: auto;
    color: rgb(255, 255, 255);
    text-decoration: none;
    white-space: normal;
    width: 894px;
    min-height: 0px;
    min-width: 0px;
    max-height: none;
    max-width: none;
    text-align: left;
    line-height: 75px;
    letter-spacing: normal;
    font-size: 50px;
    font-weight: 200;
    transform-origin: 50% 50%;
    opacity: 1;
    transform: translate(0px, 0px);
    visibility: visible;
}

#Slider .h2--small .heading-line--1{
    position: absolute;
    display: block;
    top: 53%;
    margin-left: 20px;
    z-index: 11;
    font-family: futura-pt;
    font-style: Regular;
    text-transform: uppercase;
    height: auto;
    color: rgb(255, 255, 255);
    text-decoration: none;
    white-space: normal;
    width: 894px;
    min-height: 0px;
    min-width: 0px;
    max-height: none;
    max-width: none;
    text-align: left;
    line-height: 75px;
    letter-spacing: normal;
    font-size: 50px;
    font-weight: 500;
    transform-origin: 50% 50%;
    opacity: 1;
    transform: translate(0px, 0px);
    visibility: visible;
} 

#Slider .content_subtitle{
    position: absolute;
    display: block;
    top: 68%;
    margin-left: 20px;
    z-index: 9;
    font-family: futura-pt;
    color: rgb(255, 255, 255);
    text-decoration: none;
    white-space: normal;
    width: 579px;
    height: 87px;
    min-height: 0px;
    min-width: 0px;
    max-height: none;
    max-width: none;
    text-align: left;
    line-height: 29px;
    letter-spacing: 0px;
    font-weight: 400;
    font-size: 24px;
    transform-origin: 50% 50%;
    opacity: 1;
    transform: translate(0px, 0px);
    visibility: visible;
}

#Slider .button--inline{
    position: absolute;
    display: block;
    top: 85%;
    margin-left: 20px;
    z-index: 8;
    background-color: rgba(0, 0, 0, 0);
    font-family: "News Cycle";
    text-transform: uppercase;
    height: auto;
    width: auto;
    color: rgb(255, 255, 255);
    text-decoration: none;
    white-space: nowrap;
    min-height: 0px;
    min-width: 0px;
    max-height: none;
    max-width: none;
    text-align: left;
    line-height: 23px;
    letter-spacing: 2px;
    font-weight: 700;
    font-size: 20px;
    transform-origin: 50% 50%;
    opacity: 1;
    transform: translate(0px, 0px);
    visibility: visible;
    border-width: 0px;
    border-radius: 0px;
}

#Slider .button--inline .b8{
    color: #EF8524;
}
}

/* For tablet devices 768px to 992px */
u/media only screen and (max-width: 992px) and (min-width: 768px){
#Slider .swiper-button-prev,
#Slider .swiper-button-next{
 top: 38%;
 background: none;
 color: #FFFFFF;
 opacity: 0;
}

#Slider .h2--small .heading-line--0{
    position: absolute;
    display: block;
    top: 45%;
    margin-left: 20px;
    z-index: 11;
    font-family: futura-pt;
    font-style: Regular;
    text-transform: uppercase;
    height: auto;
    color: rgb(255, 255, 255);
    text-decoration: none;
    white-space: normal;
    width: 894px;
    min-height: 0px;
    min-width: 0px;
    max-height: none;
    max-width: none;
    text-align: left;
    line-height: 75px;
    letter-spacing: normal;
    font-size: 60px;
    font-weight: 200;
    transform-origin: 50% 50%;
    opacity: 1;
    transform: translate(0px, 0px);
    visibility: visible;
}

#Slider .h2--small .heading-line--1{
    position: absolute;
    display: block;
    top: 58%;
    margin-left: 20px;
    z-index: 11;
    font-family: futura-pt;
    font-style: Regular;
    text-transform: uppercase;
    height: auto;
    color: rgb(255, 255, 255);
    text-decoration: none;
    white-space: normal;
    width: 894px;
    min-height: 0px;
    min-width: 0px;
    max-height: none;
    max-width: none;
    text-align: left;
    line-height: 75px;
    letter-spacing: normal;
    font-size: 60px;
    font-weight: 500;
    transform-origin: 50% 50%;
    opacity: 1;
    transform: translate(0px, 0px);
    visibility: visible;
} 

#Slider .content_subtitle{
    position: absolute;
    display: block;
    top: 72%;
    margin-left: 20px;
    z-index: 9;
    font-family: futura-pt;
    color: rgb(255, 255, 255);
    text-decoration: none;
    white-space: normal;
    width: 579px;
    height: 87px;
    min-height: 0px;
    min-width: 0px;
    max-height: none;
    max-width: none;
    text-align: left;
    line-height: 29px;
    letter-spacing: 0px;
    font-weight: 400;
    font-size: 24px;
    transform-origin: 50% 50%;
    opacity: 1;
    transform: translate(0px, 0px);
    visibility: visible;
}

 .button--inline{
    position: absolute;
    display: block;
    top: 85%;
    margin-left: 20px;
    z-index: 8;
    background-color: rgba(0, 0, 0, 0);
    font-family: "News Cycle";
    text-transform: uppercase;
    height: auto;
    width: auto;
    color: rgb(255, 255, 255);
    text-decoration: none;
    white-space: nowrap;
    min-height: 0px;
    min-width: 0px;
    max-height: none;
    max-width: none;
    text-align: left;
    line-height: 23px;
    letter-spacing: 2px;
    font-weight: 700;
    font-size: 20px;
    transform-origin: 50% 50%;
    opacity: 1;
    transform: translate(0px, 0px);
    visibility: visible;
    border-width: 0px;
    border-radius: 0px;
}

.button--inline .b8{
    color: #EF8524;
}
}

/* Large devices (laptops/desktops, 992px and up) */
u/media only screen and (max-width: 1200px) and (min-width: 992px) {
#Slider .swiper-button-prev,
#Slider .swiper-button-next{
 top: 45%;
 background: none;
 color: #FFFFFF;
 opacity: 0;
}

#Slider .h2--small .heading-line--0{
    position: absolute;
    display: block;
    top: 50%;
    margin-left: 20px;
    z-index: 11;
    font-family: futura-pt;
    font-style: Regular;
    text-transform: uppercase;
    height: auto;
    color: rgb(255, 255, 255);
    text-decoration: none;
    white-space: normal;
    width: 894px;
    min-height: 0px;
    min-width: 0px;
    max-height: none;
    max-width: none;
    text-align: left;
    line-height: 75px;
    letter-spacing: normal;
    font-size: 60px;
    font-weight: 200;
    transform-origin: 50% 50%;
    opacity: 1;
    transform: translate(0px, 0px);
    visibility: visible;
}

#Slider .h2--small .heading-line--1{
    position: absolute;
    display: block;
    top: 58%;
    margin-left: 20px;
    z-index: 11;
    font-family: futura-pt;
    font-style: Regular;
    text-transform: uppercase;
    height: auto;
    color: rgb(255, 255, 255);
    text-decoration: none;
    white-space: normal;
    width: 894px;
    min-height: 0px;
    min-width: 0px;
    max-height: none;
    max-width: none;
    text-align: left;
    line-height: 75px;
    letter-spacing: normal;
    font-size: 60px;
    font-weight: 500;
    transform-origin: 50% 50%;
    opacity: 1;
    transform: translate(0px, 0px);
    visibility: visible;
} 

#Slider .content_subtitle{
    position: absolute;
    display: block;
    top: 68%;
    margin-left: 20px;
    z-index: 9;
    font-family: futura-pt;
    color: rgb(255, 255, 255);
    text-decoration: none;
    white-space: normal;
    width: 579px;
    height: 87px;
    min-height: 0px;
    min-width: 0px;
    max-height: none;
    max-width: none;
    text-align: left;
    line-height: 29px;
    letter-spacing: 0px;
    font-weight: 400;
    font-size: 24px;
    transform-origin: 50% 50%;
    opacity: 1;
    transform: translate(0px, 0px);
    visibility: visible;
}

#Slider .button--inline{
    position: absolute;
    display: block;
    top: 77%;
    margin-left: 20px;
    z-index: 8;
    background-color: rgba(0, 0, 0, 0);
    font-family: "News Cycle";
    text-transform: uppercase;
    height: auto;
    width: auto;
    color: rgb(255, 255, 255);
    text-decoration: none;
    white-space: nowrap;
    min-height: 0px;
    min-width: 0px;
    max-height: none;
    max-width: none;
    text-align: left;
    line-height: 23px;
    letter-spacing: 2px;
    font-weight: 700;
    font-size: 20px;
    transform-origin: 50% 50%;
    opacity: 1;
    transform: translate(0px, 0px);
    visibility: visible;
    border-width: 0px;
    border-radius: 0px;
}

#Slider .button--inline .b8{
    color: #EF8524;
} 



</style>
</head>
<body>
<link rel="stylesheet" href="https://unpkg.com/[email protected]/swiper-bundle.min.css">
<!-- Slider main container -->
<div class="swiper-container">
  <!-- Additional required wrapper -->
  <ul class="swiper-wrapper">
    <!-- Slides -->
    <li class="swiper-slide">
    <div>
        <video 
source src="//nyside2.internet.dk/wp-content/uploads/2022/03/moviefront720.mp4" type="video/mp4" lazyload="//nyside2.internet.dk/wp-content/uploads/2022/03/moviefront720.mp4" ></video>
    <div class="video-overlay"> </div>
    <h2 class="h2 content-copy__title h2--small"><span class="heading-line heading-line--0">Forretningsorienteret</span>
    <span>
        <strong class="heading-line heading-line--1">
            bureau
        </strong>
    </span>
    </h2>
        <div class="b2 b2--spread content_subtitle">
            <p>
                Stærkt team med fokus på strategi og kreativitet der engagere og aktiver mennesker på deres kunderejse
            </p>
        </div>
    <div class="button hero-content-cta z4 button--inline">
            <a href="https://nyside2.internet.dk/?page_id=37">
                <span class="b8 z2">
                Se hvordan vi gør 
                </span>
                <i class="fas fa-long-arrow-alt-right">
                </i>
            </a>
        </div>
    </div>
    </li>
    <li class="swiper-slide">
      <div>
        <video source src="//nyside2.internet.dk/wp-content/uploads/2022/03/Frontmovie2_720.mp4" type="video/mp4" lazyload="//nyside2.internet.dk/wp-content/uploads/2022/03/Frontmovie2_720.mp4"></video>
        <div class="video-overlay"></div>
        <h2 class="h2 content-copy__title h2--small"><span class="heading-line heading-line--0">Fra kr. 2.980,- / mdr.</span>
        <span>
            <strong class="heading-line heading-line--1">
                Den fulde løsning
            </strong>
        </span>
        </h2>
        <div class="b2 b2--spread content_subtitle">
            <p>
                Nyt kreativt webdesign, der løfter din virksomhed og øger effekten af din indsats
            </p>
        </div>
    <div class="button hero-content-cta z4 button--inline">
            <a href="https://nyside2.internet.dk/about/">
                <span class="b8 z2">
                Interesseret - så klik 
                </span>
                <i class="fas fa-long-arrow-alt-right">
                </i>
            </a>
    </div>

      </div>
    </li>
  </ul>

  <!-- If we need navigation buttons -->
  <div class="swiper-button-prev"></div>
  <div class="swiper-button-next"></div>
</div>

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
<script src="https://unpkg.com/[email protected]/swiper-bundle.min.js"></script>
<script>
var swiper = new Swiper('.swiper-container', {
  loop: true,
  slidesPerView: 1,
  centeredSlides: true,
  autoplay: {
    delay: 5000,
    autoplayDisableOnInteraction: false,  
  },
  navigation: {
    nextEl: '.swiper-button-next',
    prevEl: '.swiper-button-prev',
  },

 /* ON INIT AUTOPLAY THE FIRST VIDEO */
  on: {
    init: function () {
      console.log('swiper initialized');
      var currentVideo =  $("[data-swiper-slide-index=" + this.realIndex + "]").find("video");
      currentVideo.trigger('play');
    },
  },
});

/* GET ALL VIDEOS */
var sliderVideos = $(".swiper-slide video");

/* SWIPER API - Event will be fired after animation to other slide (next or previous) */
swiper.on('slideChange', function () {
  console.log('slide changed');
  /* stop all videos (currentTime buggy without this loop idea - no "real" previousIndex) */
  sliderVideos.each(function( index ) {
    this.currentTime = 0;
  });

  /* SWIPER GET CURRENT AND PREV SLIDE (AND VIDEO INSIDE) */
  var prevVideo =  $("[data-swiper-slide-index=" + this.previousIndex + "]").find("video");
  var currentVideo =  $("[data-swiper-slide-index=" + this.realIndex + "]").find("video");
  prevVideo.trigger('stop');
  currentVideo.trigger('play');
});
</script>
</body>
</html>