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?