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@zhiwei-zheng
@smwforever45 It happens in the same game run where your bird leveling from M1. If you buy 500 at 0 MP M1, you will go to M2 in the game run everything goes normally. But if you quit at this time(however, I suggest grind or buy for like 1000 before quitting), it will be negative 100k to M3, which is actually M10.