Jumping Button Problem

Hi everyone,

I need an external view of a bug that occurs on the smartphone. A customer has a Galaxy 9 plus. As you can see in the video, there is a round button at the bottom right. At a certain point, it jumps out of the picture to the right.

Do you have any idea what this could be?

Here is the Bug Video: (Dropbox Link)

Here is the link to the page:

And a preview link:
https://preview.webflow.com/preview/ecstaticdance-corfu?utm_medium=preview_link&utm_source=designer&utm_content=ecstaticdance-corfu&preview=2d140a9ac40ec19394304d241f8dbe8e&workflow=preview

Thanks to you

Here a shot from the video / button