The responsive menu overlays the content when displaying the additional menu items on "mobile" (iPhone in my case). Not only does it look unprofessional, it makes it difficult to make a menu selection.
My suggestion is to have it like "the others guys" have it, in that each additional menu item has it's own "line" and bounding box and pushes the content down when displayed.
This is one area that, IMHO, needs improvement quickly in order for TT to become a serious contender in it's amazing advance over "them" :-)