irregular font weight change on menu hover

Hello Kriesi team,

I am hoping hoping hoping(!!!) that you might be able to help with an issue on the main nav menu. I’ve been trying to fix the CSS on this for 3 days and have gotten absolutely nowhere. Here’s what’s happening:

In Firefox Mac, the main nav on my site looks fine and works fine. But in Safari Mac and Chrome Mac, the weight of the font changes (becomes thinner) in one of two situations: 1) When the page displays a color section at the top of the page behind the menu, then the entire main menu is displayed at a thinner weight. 2) On a page that does *not* have a color section at the top, then the menu font weight gets thinner only when I mouse over a menu item that contains child links.

Although I do have some custom css I’ve put into a child theme, the really curious thing is that even when I completely delete my custom css, the effect STILL happens. In other words, it looks like this has something to do with the theme configuration itself rather than my implementation of it. I have been trying to locate the piece of css that will control this and really truly just cannot find it. I really would be incredibly incredibly grateful for any help or tips on addressing this. Relevant links are in the private content area.

Thank you very much in advance!