Huh - I reloaded, and now it matches up. I was looking at the post scores on the sidebar (it was showing the post scores blanked out on the user page, which it does for posts that are too new), and the sidebar has a bit of delay between updates that could easily explain it. On the other hand, that leaves the original question unexplained. Hmm.
I just noticed that calcsam, who just posted two top posts in the main section of the site, only has the 100 karma that he has, so far, gained from those posts.
I don't object to those posts being there, but how did he do that?
Edit: Question answered; Eliezer mucked around with the karma system to make this possible in this specific case.