Why have I started gaining weight?

Hey guys! So recently I upped my exercising from 10000 steps to 15000, and in the process, I've gained four pounds which I can't seem to take off again. Overall, I burn 7-800 cal every day that I exercise (three to four times a week) and I'm eating an average of 12-1500 cal every day. Any suggestions on what I'm doing wrong and how to fix it?

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