There was a slight bug in the code that was resolved, it involved negating the credit for joining, and multiplying that by the factor, when the joined member makes his first post and becomes upgraded into the posting members usergroup.
In other words, when you make your first post here, a lot of things happen (including giving you permission to use the private message system). The bug was reversing your join credit and multiplying that by the factor. I have patched it now and recalculated totals.
Apologies in advance if I am slow to reply to your PM. I suggest posting in the forums for support if you need something urgent.