Go back to the switch test. Remove the balls and reset the Drop Target bank so they are all reset.

Your switch test should read "0".

Flick each switch in the trough and make sure that he corresponding switch is the correct switch as per the manual. Simulate the ball in the trough, and watch what the switch test does as it rolls over each switch. It may simply be a matter of adjusting the switch. I had similar issues with Fathom.