Iam new to pachinko's and need help with my starwars machine.

On the back of the machine, there is a BALL FLOW STOPPER, i take it that the ball stopper must be in the UP possition, to let balls to flow from the top?

Just down from the ball flow stopper is a white knob, in the clockwise position, a ball will flow from the top to the bottom. turn it anti clockwise and the balls will stop.

with the machine on, if i go to fill the machine up, the balls that i put in get ejeted, back to the shooting tray, this does not seem right.

any help will be most grateful