main nav is blank initially on iPhone

Phone menu doesn’t show initially.

When the site loads on an iPhone (haven’t test any others) and the hamburger is clicked, content slides right and a menu area appears to the left as it should, but no menu. Navigating to any other page from the home page, using the footer menu, the main nav displays as expected.

http://silveradocafe.wpengine.com/

Any ideas Scott?