Navbar menu not showing when clicked only on mobile version

Hey! This might be something silly, but I’ve spent a long time and haven’t figured it out:

My menu bar is working fine on tablet and mobile landscape, but when it gets to mobile PORTRAIT, it simply does not show anymore. On the preview mode if I click on it, nothing happens. I can see the elements are there in the designer, but they simply do not appear. I’ve checked and none of them seem to be hidden. Not sure what else could be causing this. Pleas help!!

Here is my site Read-Only: Webflow -