homepage link not linking correctly on multisite set up

Hi there,

I'm running a WPMU install with several sites active. http://www.meanfitfoxes.com has some weirdness with the links. Some links appear to point to the main site subdirectory, ie. http://www.kenliu.co.uk/meanfitfoxes rather than meanfitfoxes.com

Most noticeable is clicking the logo to return to the homepage

Thanks,
Ken