Karma/reputation calculation error on question downvotes

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I'm one of the frequent user of this recently opened Q/A site, based on AskBot, http: //help.openerp.com/questions/. Some bugs have been already reported by other users and today I detected another one and asked on the site. But after some deliberation we concluded that is should be an AskBot issue so I'm posting the question here.

I just downvoted the following question 500 internal error: http:// help.openerp.com/question/2087/500-internal-error/. And loosed 2 karma points. I'm ok with that, I'm working for the community.

Then I "unvoted" my downvote and got a +1...Hmmm, I thought I was going to get back my +2 karma points. So what occurs if I downvote again, does it will take away one or two karma points? Gotcha! It took away 2 karma points. I think if I downvote and undo it, it should at least add back the 2 karma points that where removed.

Wanted to add an image but I'm not allowed until karma>20. Please check the question on the site to check the image. Just in case, here is the text version.

Your karma change log
0    -2    500 internal error (1 hours ago)
1     0    500 internal error (1 hours ago)
0    -2    500 internal error (1 hours ago)

PS: not enough karma for the links, sorry for the mess