Just noticed a bug of the mobile version of the website using my Nexus 7. One of the images that changes at the top has a greater hight than the others. If you read something further down the page it will move up and down on the screen depending on what image is being shown up their (out of your view).

Like this:
https://www.dropbox.com/s/zi767mu0jhu4dou/Screenshot_2013-12-11-02-11-21.png

https://www.dropbox.com/s/so1v4xa9hiwuoq8/Screenshot_2013-12-11-02-11-30.png