Nav bar pushes menu items below itself

The hover-over items in my menu bar started displaying below the bar today, invisible unless you hover over them now (Warwickpost.com).

Oddly, this only happens in Chrome (I have cleared my cache and history several times).

I've re-loaded the theme and the child theme, to no avail. If I switch to the parent theme, however, the nav bar behaves itself.

Any ideas?https://premium.wpmudev.org/forums/#