Fancybox on tablets not playing nice

Hi all,

I have noticed over the last few weeks that fancybox has not been playing nice on my Iphone (4s if that makes a difference) and android Nexus 7 test tablet.

It keeps sitting off to one side, as far as I know I have not changed anything that should impact this.

an example page can be viewed here: http://goo.gl/bFGKNQ


It displays fine on a PC but just not on tablets etc.

Does anyone have any ideas what might be causing this? I have compared it to other installations but cannot see anything obvious.

Any help will be much appreciated!
Please let me know if you need any further info :-)

It slightly positioned to the left even on desktops. You can see it better on tablets..but there's the same problem.

I believe the problem comes from fancybox javascript.

after a bit of thinking could it be down to the viewport?