Have searched the forums for a solution to this, and tried inspecting the elements with the browser. I’m not sure where the second menu is coming from. I have megamenu installed, but I can’t see anything in those settings.
The second menu in mobile view is blank. I saw a secondary menu setting in the customiser, but changing the settings there didn’t remove it either.
Could you put me out of my misery and have a look see what is generating this second empty menu in mobile view?