Sounds like you may have reached your mining cap.  If you are Echelon 3, your mining cap is 1000. (Plus you probably got 30 coins from the airdrop.)

Higher Echelon Levels will allow you to mine more coins. Your Echelon is based on your Social Proof. Those are any posts you make that help spread the word: just enter them on your Hadron Dashboard. Then message us here on BitcoinTalk if you'd like us to review your Echelon levels.