Menu colors wrong when viewed on mobile

Hi, My website looks like it's supposed to when I view it on full-size monitor or an ipad, but the menu colors and text get messed up when viewed on a mobile phone. My website is albrechtconstructionlaw.com. The menu and submenus are supposed to be white background with black text, and has been set up that way in Theme Options>>Color Options. My laptop and ipad format the site correctly. However, on my mobile phone the menu text is white (so white-on-white) and the submenus are grey backgrounds with white text. What could be causing this, and how can it be fixed? Thanks!