Menu problems with Grid Theme Responsive

Hi Folks. I have a site with the Grid Theme Responsive Theme.
https://rainbowcrib.com/epicexposure
As you can see by the menu, it is not supposed to look like this. The second level menu items should be hanging off the primary ones.. not appearing below.
I would assume the problem lied in the header.php file, however I don’t know enough about coding to fix it myself. Would someone else have any ideas ?

Thank you so much in advance for any feedback.