Someone other than OP awarded bounty to answer with less votes ie OP didn't award it
1165
How does the bounty system work?
52146
Stack Exchange doesn't allow me to answer protected questions because I gave away earned rep in bounties
18148
My bounty is about to expire and I didn't get a good answer, just my own workaround
96392
Comment on a question without 50 reputation points
22936
Is it ok to choose a different answer for a bounty award than the one I accept?
20623
Why can't you get awarded the bounty for answering your own question?
119997
What happened to my bounty on this closed question?
20792
Delay answer downvote rep loss to voter to help hide voter's identity
31058
Responding to a poor question
16670
Removing a downvote adds reputation that wasn't there
29284
User with low reputation shows as having modified thread
83142
Should the 24-hour timeout apply to bounties awarded for "exemplary answer"?
130688
Place a bounty to reward an answer on a duplicate (closed) question
39442
Can I change which answer I chose to award the bounty to after I've done so?
23297
Provide a means to reward users and their answers (decoupled from bounties)
85905
Clarification for non-answers
13367
Best way to deal with questions answered by the OP in the question instead of in an answer