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Perhaps this will explain.
http://www.chess.com/faqs.html#a5
"As you win or lose games your rating will go up and down. Your rating is also affected by a rating deviation that says how accurate your rating is. So when you haven’t played many games, your rating can move up and down more quickly. Similarly, your rating moves less when playing an opponent with a high rating deviation because his true rating is less known. As you play more and more your rating will become more accurate and will therefore move more consistently with your performance."