Starting a bounty involves two changes: adding the bounty itself, and adding the notice. There are two corresponding history entries at the end of the bounty.
You can see that with an earlier bounty on the question you linked.
In the case of the notices you're asking about, the bounty was cancelled and refunded. You can deduce this from the fact that the notice was removed by neither the bounty-giver nor the Community user but, rather, by a moderator or employee. When a bounty is cancelled it's actually undone; it's as if the bounty action never existed. You can see this in the bounty-giver's bounty history, which shows no offered bounties.
The notices, however, remain in the question history.