Trying to use v-if directive, with vue.js and a Laravel blade file, what am I doing wrong?

I am looking for help with v-if and v-else. I thought with this code that I would get back only one of my messages, but both keep appearing on screen?

Here is my code:

<div v-if="seen">
   <span>Now you see me</span>
</div>
<div v-else>
   <span>Now you don't</span>
</div>

data: {
  seen: true,
},

Both v-if and v-else come back