In the question Is There a Difference Between Entering an Active Stargate on One Side Or The Other? I reacted, then re-considered.
I cocked up, downvoting an answer which did not deserve that, because I possess less than "necessary" reputation my downvote was not listed on public view but was registered on some database or other. I resolved to take it back by upvoting it.
The thing is, this did not negate my downvote - as far as I can tell - it positively contributed to an upvote - this is something that I did not intend to do.
No judgement intended on the question or the answer. And that's the whole big-thing point. Is this right?