zk-bootstrap not working on Iphone

[fpaitrault]

I'm currently trying to use ZK's integration of Bootstrap in my application.
It is working perfectly on my PC, Window Phone but when I try to display it on my Iphone it is clearly not working.

After some investigation, I found out that my Iphone is not able to render this page (same glitches): http://www.zkoss.org/zk-bootstrap.

I tried with an Iphone running iOS 5 and 7.1.2 same results.