So @melody495, I think that screenshot is from when I was experimenting and took out the socials and 'contact me' button in the header. That works as a fix - but only for the main menu. I found that if you open any of the dropdown lists, they still had the top two items blocked. If you go back to the site now, where those elements have been reinstated for the moment, you'll see what I'm talking about.
It seems like having too many things in the droplist is pushing the top of the menu too high so that the logo blocks the links? But even "home" which isn't hidden behind the logo can't be clicked. Is there anything that can be done about that?
(I have checked on my android phone and the issue happens in both firefox and chrome)