Yep, it uses the prefix prefixPrimary class so if it's not showing up properly that prefix class likely isn't styled (it is a default prefix class in XenForo)
It is supposed to open a list of WikiPosts in that forum. But it appears to be opening the incorrect forum. It should be linking to:
Code:
http://xf.avforums.com/sandbox/forums/home-cinema-buying-building.246/-/wikipost
Could you try temporarily disabling all other add-ons and see if it links to the correct page? This doesn't seem to happen for me. Also, what version of XenForo are you using?