Hey there,
I am really sorry for the delay of this reply as it is a weekend for us here.
It seems like your site hitting some Javascript error, can you try temporary disable your site JCH optimise plugin and clear your backend cache and see how it goes?
If that menu button clickable when you view on mobile, then try re-enable back this JCH optimise plugin and see whether that issue still persists.
If yes, can you update your site backend and FTP access at
http://stackideas.com/dashboard/site so we can better have a check.