Interactions won't work upon first entry to page

Hello all,

when first entering the preview of my website the ‘read more’ animation down by ‘Expert opinion’ is not working. It is directly showing the text that is supposed to be covered when entering the page.
However, when reloading the start side with a click on the icon in the upper left corner it is suddenly working.
Does anyone have any idea why the animation is not active when first entering the page?

Thank you in advance!

Here is my site Read-Only:

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