It seems what must have happened is that the first time you uploaded a bot but the version did not increment, something must have happened between adding your bot to the bot history and incrementing the bot version number. Then, every time after that, your bot version number would not increment, because first it would try to save your bot's current statistics into the history table, but since the version number never incremented, this would always fail with an error (since version 2 already has a record in the history). Thus, your bot would never have its version number incremented.
It's not any problem on your end. I will manually increment your bot's version number, and you should be good.