I am upgrading a Rails 4 app to Foundation 6 (from 5), and am having a problem with the topbar vertical menus. When the page loads, any vertical menus attached to a sticky topbar display behind the page content rather than in front.
If the page is scrolled by as little as 1px, then the vertical menus display in front of the page content as they should.
I've posted a bare bones example displaying this behaviour here.
Any help is greatly appreciated.