This can happen for several reasons. For the brushless AC motors, you need to swap any two of the three wires connected to the ESC. This will change the motor spinning direction. For the brushless DC motors, you need to check if the propellers are mounted properly, because the brushless DC motors do not move in the wrong directions unless the connection is faulty. Also, check that the drone's booms are not twisted. Calibrating the compass and magnetometer will also help if there is no hardware problem.