Navigation section links not landing correctly on mobile

I don’t get what to do or where to debug.
The in pages linking isn’t aligning how it should be and as a bonus some layers that should be invisible pop up, but disappear when touching screen. So when I go to the top section and move from there (via menu buttons) to any other section the thing works. But when I move from somewhere else other than top section to anywhere (other than top section) aligning is off.
These are happening on mobile.

Here is my public share link: LINK
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