Ok, solved, it was a css compatibility issue.
Ok, I’ve just uploaded the site, and the weird thing is now it works with Firefox but shows the same height issue in Chrome!
link: http://shoutkey.com/pirouette
password for wordpress site (I’m using the “Hide my site” plugin before releasing it): 321
I’ve just noticed that in private browsing mode in Firefox it works correctly! Anybody has any suggestions?