Posts all show up as post #1

Hi there, I'm administering a wpmu for a campus news website. Seems that this category mapping plugin is precisely what I need. However, I've run into an issue: After setting up mapping etc, all posts added in a certain category show up on the category page on the root blog as another instance of the first post on that subblog.
For instance, my campus-news category on the root blog should have two entries: one for the Hello World! post on the (only active) subblog and one for the first post I made on that subblog. However, on the category page on the root blog, the two entries are both to the Hello World post.
Any ideas on how to fix this? All your help are belong to, err, is appreciated.
I'm running WPMU 2.8.6 and PHP 5.2.10.