AgencyPro theme Dropdown menu appearing behind images in Chrome

I am using a plugin to have flip tiles on a homepage. I changed the z-index of the plugin so that the main menu appears in front of the tiles. The problem is if you are using a Chrome browser, you can get the dropdown menu to move behind the tiles by hovering the cursor over a menu option, then moving the cursor to the background, and then moving back over the menu option. The second time the menu appears, it will end up behind the tiles. I haven’t been able to recreate this issue in any other browser.

I have the site set up here.
http://fastfindsitedemo.us/

Any ideas?