localStorage overwrites whenever I refreshed the browser / close and there new imput

I was given a project to do for practice, the idea of the project is to create a create a form that I will create a timesheet, store in local storage and display it every data stored in a table . I’m using an array to store all the user inputs as objects and then use push method store it inside the localStorage.

Everything seems to work as I want, even when I refresh the page the localStorage is still intact. However when the user makes a new input, the localStorage gets overwritten.

this is my code

I create a function to save the data in array form inside localstorage,
I used push method

const addTask = document.querySelector("#submit");

let timeSheets =
  localStorage.getItem("timeSheets") !== null
    ? JSON.parse(localStorage.getItem("timeSheets"))
    : [];

addTask.addEventListener("click", (event) => {
  event.preventDefault();
  console.log("Btn Clicked");

  saveData();
  // showData();
});

function saveData() {
  const record = {
    // id: document.getElementById("id").value,
    task: document.getElementById("task").value,
    timeStart: document.getElementById("timestart").value,
    timeStop: document.getElementById("timestop").value,
  };

  timeSheets.push(record);
  // timeSheets.unshift(record);
  localStorage.setItem("timesheets", JSON.stringify(timeSheets));

  console.log(timeSheets);
}

My Result in the console:

[{…}]
0
: 
{id: 332, task: '1', timeStart: '11:45', timeStop: '17:45', date: '2024-05-29'}
1
: 
{id: 329, task: '1', timeStart: '11:45', timeStop: '17:45', date: '2024-05-29'}
2
: 
{id: 90, task: '1', timeStart: '11:45', timeStop: '17:45', date: '2024-05-29'}
length
: 
3

After refreshing or close the browser, and there is new input, it overwrites

[{…}]
0
: 
{id: 0, task: '3', timeStart: '10:50', timeStop: '11:50', date: '2024-06-07'}
length
: 
1
[[Prototype]]
: 
Array(0)

I expect the new input to add to the existing one