Well, that's normal - +500 MMR for calibration. But I played almost all my games in a party (so fewer victory points per win), and on top of that, I played my last game in a full stack with some really wild drunks, which is why my calibration ended up at 9-1 instead of 10-0.
Here are answers to some of the most common questions.
What is boosting?
Dota 2 account boosting is a service where, after you place an order, we assign a booster to improve your account according to the service you selected. You can add optional paid extras to a rating boost. For example, with Duo Boost, you play on your own account in a party with our booster.