Problem with Navbar Collapse coming up behind page elements

Hi, I have tried and tried to figure out why my Navbar Collapse is coming up behind page elements (on all of my pages). The Navbar Collapse is part of an include file used on all of my pages. See below, does anyone know why this would happen or how I can fix it?

Thanks for any help in advance

www.mypizzamaster.com to see it happen live.