I would check to ensure the set screw is in the right place. If I remember correctly when the plunger is fully extended the diverter should be open, but only enough to just be touching that back wall. Mine was overextended causing the reverse issue - it would open and shut immediately. You set it by loosening the screw, opening the diverter, extending the plunger to the right spot, and then re-tightening.
If that is correct I'd go into your switch test and check switches to ensure they are working correctly / nothing is stuck open. I know the left orbit should control its opening and closing - unsure what other switches. I'm guessing the shooter lane.
Springfield, MO
