Show more link in expandable text box - content space will not collapse... why not?

Followed this wix tutorial to create a show more link (https://support.wix.com/en/article/wix-code-tutorial-creating-a-show-more-link) and the link is created, but the inspector says the text box is absolutely positioned and set to a height of 800 some pixels. It is supposed to collapse and the boxes that follow are not more than 70px away, so the question is, why doesn’t it? See the preview page here: http://wix.to/hMAmAGc

I was offered a solution in this post:

I implemented the workaround but it leads to another problem – how to render the
tags within the text string.

Are there any solutions for this? Or for the original problem when following the tutorial to create an AddMore button?