Menu missing from mobile and tablet

Hi there, I hope someone can help. I've read the entire Catch Flames (free/WP) forum, but nothing there quite applies. The menu at (http://martinmyerswrites.com) shows fine on laptop and desktop viewings. It does not show on the mobile version. And it does not show on tablet when in portrait (but does show there, in landscape). I have tried in previewers (in theme customization) and on a couple of different phones. I don't see anywhere on the phone version that might be a collapsed responsive menu. And odd things happen with the "Reader Version" too - this could be an iPhone issue, but when I click Reader version, I get various different pages. Any help would be most appreciated. Thank you!