Broken Layout on iOS devices

Greetings,

First thing, thank you for providing such beautiful theme.

It is great fun and very easy for me to edit the pages.

This is the URL of the page that I made,

http://www.redfox.co.jp/designlab/

and on my PC, the web displays fine and

even on the responsinator, the web looks fine.

http://responsinator.com/?url=www.redfox.co.jp%2Fdesignlab%2F

but when the page is open on iOS device /iphone 4s,5 ipad it becomes broken.

I have no idea what the problem is.

Could you please take a look in what maybe the issue?

best,

Yohan