Mobile menu covering page - disabling functions on page

mobile menu (top right) after opened, disables the drop down menu in the body of the page.

these drop downs open before the menu is selected.

I have the Z values accounted for, but something is still off… hours of tinkering and im over it…
any help would be amazing. thank you in advance

Here is my site Read-Only: (Webflow - QUANTUM RESEARCH)