Navbar trouble - Doesn't appear in Chrome

Hello there - been a while since I’ve done web dev so this one is stumping me. Our site has a navbar that works fine in Safari and Firefox, but it does not work well for Chrome users.

Specifically, Chrome doesn’t show the navbar on load. It does show when the user manipulates the window, somewhat unpredictably. Is this something related to transform3d or some sort of transition?

Thanks in advance!!

Here is my site Read-Only: LINK
(how to share your site Read-Only link)