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That does sound like an issue with the server. You could delete the old version from your rumble client - since it's not in the participants list, you won't re-download it.

Sometimes, an old bot can be re-added because someone stopped their client before uploading results and they were cached. In the past, this could also result in other clients running battles for that bot once it was re-added, but I thought Darkcanuck had fixed that issue.