I looked at my reputation today and noticed something odd, an 'unupvote' on my answer to this question. This occurred after my answer was edited for a very minor spelling issue.
I've never heard of this and as far as I know, one can not change their vote after placing it so it's not the unclicking of an up vote. Because there is no explanation, my answer is on point and as far as I know has no issues, and I can't find any information on unupvote, I feel like I did something 'wrong' or it's a punishment? If I did something, I would like to know what it is so I can correct it
What makes this occur? Is there something I can do to improve my answers so I am not unupvoted?