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Kind of hard to believe; but possible. In general, not sure the system cares if you upvote yourself, or if you have a bot do it; it should payout the same regardless at the end of period. If you can document this, it's probably a bug, and needs to be fixed; we would all appreciate hearing about it if you can track it down.

Yah it might probably be a bug. I am planning to lodge a complain about it in steem voter support on the discord channel.