How do I put different values to different textareas?

I'm working with Laravel 5 and I've the following HTML pages:

HTML 1

<div class="row">
   @foreach($postList as $post)
       @include('Pages.Post.postInGroup', ['post'=>$post])
   @endforeach
</div>

HTML 2

<div class="publication_item col-lg-12">
    <div class="row align-items-center">
        <div class="col-9 col-sm-9 col-md-10 col-lg-10 col-xl-11">
            <img src="" style="border-radius: 50%;" width="30" height="30" alt="User Picture">
            Posted by:   <span class="textLighter"></span>
        </div>
        <div class="col-3 col-sm-3 col-md-2 col-lg-2 col-xl-1" align="right">
            @if($post->user->id === Auth::user()->id)
                <a href="#" role="button" data-toggle="modal" data-target="#editPost"><i class="ion-edit"></i></a>
            @endif
        </div>
    </div>

    <hr>

    <!-- first row -->
    <div class="row">
        <div class="col-9 col-sm-9 col-md-10 col-lg-10 col-xl-11" data-toggle="modal"></div>
    </div>
    <hr>

    <!-- second row -->
    <div class="row align-items-center">   
        <div class="col-3 col-sm-3 col-md-2 col-lg-2 col-xl-1" style="display: inline-block;">
            <img src="" style="border-radius: 50%;" width="30" height="30" alt="User Picture">
        </div>
        <div class="col-9 col-sm-9 col-md-6 col-lg-6 col-xl-9" style="display: inline-block;">
            <input type="text" class="form-control" placeholder="Post a comment">
        </div>
        <div class="col-1 col-sm-1 col-md-1 col-lg-1 col-xl-1" > <!--style="display: inline-block; margin-right: 1px;"-->
            <a href="#" id="btn-comment" dusk="commentButton" class="btn btn-primary" role="button" data-toggle="modal" data-target="#addComment" style="background-color: #228B22;">
                Comment
            </a>   
        </div>
  </div>

Edit Post × Update

Delete

The HTML 1 page adds cyclically posts, which are built in HTML 2 style. A post is characterized by having an author and a content (text). The HTML 2 page adds to each post the following button for editings:

@if($post->user->id === Auth::user()->id)
    <a href="#" role="button" data-toggle="modal" data-target="#editPost"><i class="ion-edit"></i></a>
@endif

That opens the modal below, containing 2 buttons (Update and Delete), and a textarea containing the text of the post, but for some strange reason when I click on any edit button of different posts, it always shows me the content of the last post inserted. How can I solve?

via Chebli Mohamed