I used the same tool to troubleshoot the issue and the submenu works fine for me by clicking on the parent menu item as shown in the attached screenshot but the sub-menu of sub-menu does not work for me.
Right, it seems the only clickable main parent menu is Home in our navigation, and that one works. The rest just open the menus for you to select. So yes none of the sub-menus are working (not clickable it seems).