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I’d asume someone downvoted, then removed the downvote. The original downvote didn’t get through, but the reversal did. Something like that
I do that constantly by misclicking.
If you use Voyager or some other front end that uses gestures on a touchscreen, you can sometimes accidentally up or downvote when scrolling or navigating.
my instance blocks downvotes
That’s my guess too.
A fediverse specific glitch.
I have -1 communities in my instance because I made a test one and deleted it early on.
Someone put in the vote?
My guess is that the dislike was removed.
I think from something I observed a couple of weeks ago, someone (or a couple people) downvoted and then their account was deleted or banned.