Problems with Ultimate Facebook Plugin

Liking posts / pages:
When someone clicks 'Like' on a post or page in a sub-site on the multisite network (domain.com/sitename), the post gets shared on their profile wall but, although the title includes a link back to the post in the sub-site (eg: domain.com/sitename/post/), there is a link below which links back to the master (top level) of the domain (eg: domain.com), which should be a link back to the sub-site (domain.com/sitename/).

Screen grab attached.

The owner of the content on the sub-site might not be too pleased about promoting the top-level of the network. Is it possible to change that?

Any thoughts on how this can be fixed?

Cheers.

Martin