I tested http://freedomrunusa.com with iOS and it looks okay to me. Here is what I see in a test using iOS 6.1: http://i.snag.gy/0i1vb.jpg
Your screenshot looks like it might (maybe??) be a theme/css issue and not a Photon issue to me (meaning the theme doesn't account for images displayed the way Photon displays them, but it should). I think.
I'd like to try to reproduce the problem in a test, but I need additional info.
What phone, OS version, and browser version are you using for mobile?
Also, could you link to the theme and slider download page if they're public?