in the screen shot you can see on which nav item to hover (its the only nav item with drop down). In screenshot you can see the red arrow point to the links (leading to post archives with the issue)
The nav linkd to archive work fine.
In the specific archives with the red arrows (in my screen shot) if you hover over the posts in the archive they are unclickable
meaning the the text and images in theses archive pages are unclickable. And in the others they work fine.