This might be my mistake but on the only bounty I offered and gave the bounty went to the wrong answer.
That is, I am pretty sure that I intended to give it to one answer, but then I got a comment from the author saying that he is confused as to why I gave it to an old answer of his, rather than to the newer and better answer he wrote due to the bounty (it was the answer to which I intended to give the bounty).
There is very little way for me to trace exactly what happened, and it's not cheap for me to conduct experiments, so I post here to see if others have experienced a similar event. Specifically, there may have been a confusion since the same author had 3 answers. I do not discount that I could have been confused, but if there's some sort of bug, it would be nice to find it.