facebook like button liking the wrong urls?

Hi Guys,

I am running my wordpress blog as an app on facebook.

here is the app url. http://apps.facebook.com/costaclassifieds

here is the actual url of the live site http://ads.gfabrecords.com/class

When the like button is clicked it posts to the users wall correctly but with the site url as ads.gfabrecords.com/class/ads/xxxxxx instead of apps.facebook.com/ads/xxxxx as i want it to.

can you please offer me some assitance here?

warm regards,