Thanks for that Wes. Removing the fade effect from global.js fixed it. I’m a web developer but this one had me stumped for a minute. I’m sorry but I can’t provide the site without permission first, but I did confirm that the bug is present in a new installation with only genesis and epik installed, just to make sure it wasn’t something I had done.
The issue, from what I’ve tested, is only on Safari. I’m having the same problem with sliders and images after you scroll down, until the header shrinks, and then scroll back to the top, sub menus drop down behind them.