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when i was playing halo i lost 1 game at lvl 29 almost lvl30 and i went down 4 lvls wtf......
One Who Knows Nothing Can Understand Nothing.
WellCould be that you were standby'ed a lot... lagged out, everybody quit, OR! the most logical thing....You quit before other games were over, thus having the exp not calculated yet, and then it hit you all at once.