That's odd...especially when your opponent had a higher rating than you.
i won a game, yet my rating went down
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I think he's complaining about online (not live) chess game. Look here: http://www.chess.com/echess/profile/narutoichigo -- he won on time against a 1528 player, and his rating dropped from 1442 to 1436.
A support ticket definitely seems in order: http://support.chess.com/index.php?_m=tickets&_a=submit
why did that happen?