Criticker had a big update on January 12th, introducing games. Almost every aspect of the website was touched, every database table and back-end file. Please report any bugs in this forum, and we'll get them fixed up as soon as possible.
On my profile page and at the top right of the screen it states I have 100 rankings. If I view the full rankings list I have only 99 titles ranked. This seems to be the case with a few other users as when I view their profile page it shows (X) number of ratings and the full ranking list show (X minus Y). Previously I accidently submitted the same game twice and only one was added to the database. Maybe this is an explanation for the discrepancy.
Hmm... alright, we'll take a look into this. Your idea for the cause of the problem is likely correct, but we'll need to clean it up along with the counts of other users who have been affected.