Hello. My name is***** can help you with your question.
I have seen this happen with certain menus. Are you using the accordion menu plug-in by any chance? If you are, there is an update for this plug-in that resolves the issue. If not, then it could be a different plug-in that is conflicting with it. If you have other plug-ins that use Jquery this can be the reason. If A Jquery plug-in is not written properly, the Jquery components in different plug-ins can conflict with each other.