how come i just lost 12 points?

That indicates your answer has incurred a violation of the Community Guidelines or Terms of Service. Checking your Violation Notice email would be your best bet, as this will tell you which answer got deleted and the reason for the violation of either set rules (often left blank sometimes). This will also give you a recourse to challenge the violation by launching an appeal to Customer Care. Now you should see why you lost 12 points.

You the two asked 3 questions (for minus 15 factors) and voted thrice (plus 3 factors), or had a 10 factor violation and deleted an answer. i've got faith it replaced into the 1st option. :o)

you probably got a violation