I'm using the mobile navigation module for a responsive menu, and it works perfect if I resize the browser window on my desktop, but it won't work on actual mobile devices (tested on iPhone and Galaxy Note 2). I've used the module before and never had any issues, and I'm using the same configuration, as far as I can tell. I can't figure out why it's not working.
This is the site I'm working on, and here's a screenshot of the problem on the Note 2. I recently upgraded my server from PHP 5.2 to 5.3, but I don't think that could be causing this issue (plus I needed to upgrade for a different module).
Other than that I really have no clue, so I'd appreciate your help.