This is likely because most of the players you are beating are rated lower than you. Here is a good starting point to learn about the rating system here: http://support.chess.com/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=101
Rating rules
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Hi.
I don't understand the rating rules. How is the rating scores calculated when loosing or winning a game. I've won more games than I've loosing, but even so, it seem like I'm loosing more rating than I'm winning. When I'm winning I often get +3 or +6 scores, but when loosing I often loosing -10 or -12 scores.