I asked moderator to migrate this question, before that I started a bounty with 50 reputation, and now it seems gone ?
1 Answer
According to the history, you started the bounty on August 5th, and it expired on August 13th with no winning answer chosen. It didn't get migrated until August 18th
Questions with bounties can't be migrated anyway, so if you put a bounty on a question it's usually stuck on the site it's on for a while