Mobile menu is completely gone

I just recently realized that my mobile menu is completely gone. At the same time I noticed that my navigation menu lost the icons I was using and the menu items within the body text had no bullets. So I think something happened to my ul's in the css. I have since fixed the navigation menu but the mobile menu and original arrow bullets that came with the montezuma theme are gone.

Here is the site:

http://smsdesignlab.com/

Any ideas?

Thank you in advance.