Answered a question with an open 250 pt bounty that was set to close in 5 days. The OP resolved the issue themselves, but marked my post as the answer because it was "the most helpful". However, I didn't get the bounty.
NP, I thought maybe I would get it after the five-day deadline. But that came and went, no bounty was awarded. Now, when I go to the question, there's no trace of the question ever having a bounty!
I thought a bounty couldn't be withdrawn after it was offered... what gives?