Hi,
recently made a homemade drone with F450 quadcopter frame. I used the arduino uno to make flight controller using multiwii platform. But as i tried to fly it by increasing the throttle it pushed from one side only .I thought that my motors are not spinning at the same rate. Can anyone tell me that why is my motors are not rotating at the same rate ?

I have used the 30A esc and 1400KV BLDC motors.