This could just be a coincidence or a misinterpretation, but I'm reporting it in case it's actually a bug. (EDIT: not a bug - just an errant comment. See the comments at the second linked SO question.)
I don't get a lot of upvotes on old questions, but just today I got a report in the "reputation" part of my profile that someone upvoted this question, even though I have a comment at the same time by a user who says they upvoted this question.
Unfortunately I can't remember how many votes either question had before. Of course, it could either be a coincidence, or the comment could be inaccurate. This is obviously not urgent but I wanted to provide the report in case it's something real but rare.