On this question, where the “start bounty” link should be, I see:
Haha, what? (Clicking it takes me to the help page.)
Meta Stack Exchange is a question and answer site for meta-discussion of the Stack Exchange family of Q&A websites. It only takes a minute to sign up.Sign up to join this community
You have had bounties on this question before. Actually, you had a 500 bounty on it.
As result, you can't offer another bounty on it. Additionally, having < 500 rep doesn't help with the logic (say you had a 400 bounty there but < 450 rep - you can't offer a bounty).
This is why you are not seeing a
start a bounty link - a fairly unique set of conditions - it is your own question, you have had a max bounty on it and you have less rep than what the max for a bounty is.
This is a real edge case - not sure what we will do about it.