Looking forward to have it fixed on Momentum template. That is the template that I noticed and reported the bug and I use for my online computer graphics school:
n-pix.com
I have the same issue with an old template (Modulus v1.6.2) and have upgraded the RokNavMenu to 1.13 but same issues, I don't have a membership to get the patch now as I tried to rejoin several times and it failed and I emailed several times but got absolutely no reply so for that site I joined Yootheme and so am not (Even if I could!!!) joining here again just to download a fix to a bug that shouldn't be in a release.
So now I have this issue on an older site and don't really want to have to pay for a new membership to fix an issue from yourselves or redevelop the whole thing in Yootheme, is there not just a patch/hack I can add to solve this??
PS:
I have disabled Gantry Caching but same issue??
PPS:
I am not using the RokNavMenu as a menu module, the menu is showing as just Menu and caching is off for this module too?
If I have either the Joomla cache (Global Config, plugin for page cache is OK) or RT cache enabled I have the issue, turn them both off and its fine.
It hapens to me also (registered users menu, BUT just for romanian as I observed, not for english), for Epsilon theme I just bought, animated drop-down menu under:
Joomla! Version Joomla! 3.6.0 Stable [ Noether ] 12-July-2016 21:14 GMT
Joomla! Platform Version Joomla Platform 13.1.0 Stable [ Curiosity ] 24-Apr-2013 00:00 GMT
User Agent Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36
No one of 2 cache methods didn't work. I had to set it OFF.