A day or so ago, my achievents icon showed an upvote of 10 rep, and when I clicked on the icon it sent me to:
https://electronics.stackexchange.com/a/195369/43191
it showed the upvote, and after looking over the answer I founed an error, fixed it, and made the answer a little better, in my opinion, by fleshing it out more thoroughly.
Others seemed to disagree, without comment, and after that I received enough downvotes to get me to -1 on the answer page (two, as shown on my user page) and a loss of 12 rep as shown on my achievements icon.
from:
https://stackoverflow.com/help/whats-reputation
I get:
You gain reputation when:
question is voted up: +5
answer is voted up: +10
answer is marked “accepted”: +15 (+2 to acceptor)
suggested edit is accepted: +2 (up to +1000 total per user)
bounty awarded to your answer: + full bounty amount
one of your answers is awarded a bounty automatically: + half of the bounty amount (see more details about how bounties work)
site association bonus: +100 on each site (awarded a maximum of one time per site)
You lose reputation when:
your question is voted down: −2
your answer is voted down: −2
you vote down an answer: −1
you place a bounty on a question: − full bounty amount
one of your posts receives 6 spam or offensive flags: −100
My question is: If I started out with 10 and lost two, I should be left with 8, according to the rules, so how could I wind up with minus 12?