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Bug in Firefox when trying to hover over a dropdown

Hi, there is a bug on my page in Firefox: when I try to hover over a dropdown (it should open on hover), the page jumps a little bit upwards.
You can see it in this gif (I hope it is recognizable):
ezgif.com-gif-maker

And here is my read-only link:
https://preview.webflow.com/preview/interactive-papers-awesome-project?utm_medium=preview_link&utm_source=designer&utm_content=interactive-papers-awesome-project&preview=c3959e492b478c6a2df6e38c39731bc7&mode=preview

Anybody know what the issue could be? Thanks :slight_smile: