This morning I looked at an answer that I had up-voted last year, and realized that I had originally misread part of it. It really shouldn't have had my up-vote, so I clicked on the up-triangle, and instead of removing my vote, it added another point to the score.
Rather than correcting my mistake, I doubled it. And to make it worse, my two votes are the only votes on this answer.
Are we really allowed to vote more than once?
And if this isn't a bug, how should I have removed my vote?
This would have been pretty unheard of; the system won't let you vote twice on a post with the same account. Was the upvote arrow already blue when you visited the page? Perhaps you realized, say, 6 months ago that your upvote wasn't warranted and did you retract it then already. The post's score might still be 1 because another user upvoted it.
In any case, you can visit your profile and check the upvotes you've given (other users, including moderators, can't see them); since there are only 48 (that number is public), you should be able to figure out quickly whether you voted for that answer in the past.
Is double voting allowed?
The real answer is no! And I truly doubt that the event you described actually happened.
You can always edit the response you updated and then you will be able to remove your vote, if you truly feel the response does not merit being upvoted by yourself.
