This is my first time in this forum, so hello!
We have the Milonic menu built into out work CMS, and usually it works really nicely, however I'm having trouble with it in Firefox on my latest site (it work in IE

If you look at the page source (using Firebug or similar), you can see that the style 'left' property is set to -4px (which is odd, on working sites it shows up correctly).
Would someone who knows more than this than me possibly be able to take a look? I'm stumped!
URL: http://tiz2.peppersuite.co.nz
Thanks in advance,
Rob