For some reason I must realize strange movement on several sites I recently did.
As one example I add one page from one site: www.bit-coaches.de
That´s the muse (only one page-the landing page).
I took the privilege of checking your file out, and noticed the issue was because of incorrectly pinned composition menu placed on your site.
After setting each object of your menu i.e the trigger, rectangle, and the whole composition is pinned to top right or right which ever is applicable it seems to work fine.
Here is your file -
Well, I feel privileged to get watched out by you, so many thanks, I will check it out and get back to you after checking the uploaded site, being quite sure that your solution helps.
Thanks and best Regards,