Menu broke in Safari 5.1.4

Hi there,

My site is:

http://www.printglasgow.co.uk

and when you hover over the pricing category on the menu in Safari 5.1.4 all the other categories are pushed down below the nav bar. The menu works fine in every other browser, even Safari 5.0.3!

Any ideas?

The menu code:

[CSS moderated as per the Forum Rules. Please just post a link to your site.]