Need help with Menumatic CSS Problem

I have Menumatic (at least that’s what I think it is) installed as part of the iVideogames theme and on the main navigation the first <li> that contains a sunmenu is making the following <li>s overflow. The problem is intermittent which is very confusing that sometimes it works and sometimes it doesn’t. I have been battling with this for over a week now and I am about to throw in the towel. If anyone is able to take a look using Firebug and let me know what the problem is I would be very grateful as I love this theme and want to continue using it. The site url is http://www.footballpunt.com and it is the “live odds” menu item that seems to be causing the problem. Thanks in advance

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