When I move my z and x axis manually my fans rotate and other questions


Not sure if this is a problems or not but when I move my z and x axis by hand when the machine is off (the PSU unplugged) the fans rotate. I’m guessing this is caused by the resistance in the motor creating a current? Another question I have is that my z axis doesn’t seem to want to stay perfectly level. I managed to get my coeff a and b down to .001 and .004 respectivly however my coeff d value can fluctuate between 0.01 to 9.97 (I’m guessing this is the z axis) any suggestions?