I see that the revolution slider has a console error on your site which is causing the iPhone sliders and everything else to break due to a Javascript error.
Uncaught ReferenceError: revapi1 is not defined
(anonymous function) @ (index):529
m.Callbacks.j @ jquery.js?ver=1.11.3:2
m.Callbacks.k.fireWith @ jquery.js?ver=1.11.3:2
m.extend.ready @ jquery.js?ver=1.11.3:2
J @ jquery.js?ver=1.11.3:2
Pls check these pages
http://www.foodiusapp.com/test2/
or
http://www.foodiusapp.com/test/
Since you do have license for rev slider, can you pls contact rev slider support to see if they know what’s happening? I do not see this as a theme issue and probably some configuration issue within the slider. They will be able to debug this faster than we could.
Also, as suggested by Phoenix, I would suggest you load the sample data and then making changes from there.