Doesn’t work on ipad 2

Hi, I browse your demo page with Chrome and Safari on ipad 2.

The popup doesn’t show when I click on all the examples:
http://demo.wponlinesupport.com/popup-anything-on-click-demo/

Youtube video is the only exception. The popup shows but it isn’t centered and can’t be closed.

The page I need help with: [log in to see the link]