Textarea doesn't display the encoded output correctly

I get user input from textarea and handle it on the server where it’s encoded with base64 and stored in a database, but for some reason there seems to be an encoding error when loading that content back into a textarea.

The problem is that i my case quotation marks ' and " get encoded by the form but when i display my text again the encoding remains. (it looks like sometext'moretext instead of sometext'moretext) I wonder how can i decode the values to display correctly again.

I tried decodeURIcomponent() but it didn’t work. I use razor pages and load data into textarea using asp-for="" directive.

Here is my code:

<form asp-page-handler="update" id="editor" class="editor-area" method="post">
    <textarea 
        asp-for="MainText"
        class="input-editor-area"
        id="input-editor"
        onchange="saveDraft('@Model.Contents.Id')">
    </textarea>
/* etc */

//Contents.Data is base64 encoded text
// MainText is a property with [BindProperty] attribute
MainText = Base64UrlEncoder.Decode(Contents.Data)

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