headlight motor problem
 

hey so i plugged in my headlight motor to see if i could get them synced properly and i noticed the right side headlight (once plugged in) goes say it was up originally it would go all the way down all the way up and stop in the middle.. then the button on the inside of the car has no effect to it .. but the other one works great.. now say if it was in the middle when i plugged it in.. it would do the exact same thing. i replaced the motor already and im just curious why it would be doing that?