Update: (I keep doing some of my own detective work…)
I have found that the epik demo here: demo.appfinite.net/epik/ displays the problem (and doesn’t!)
On my Nexus 5 in chrome SAMPLE on the root menu does not allow you to get to the sub menu. It shows briefly and then disappears. The LAYOUTS Menu item will display its submenu and leave it hanging their until you tap (working properly)
Both SAMPLE and LAYOUT seem to work well on ipad.