Most problems like this are “created” meaning someone has done something and caused it. Couple questions
-Did you recently purchase the machine and just noticed the problem?
-What was done recently to the machine if anything?

Often times I fine that a problem is created and it goes unnoticed for a period of time, then through the process of elimination you can find it. In my experience I think you have either a diode orientation problem or switch wiring orientation. I have seen very similar problems in the past. I had a Funhouse years ago doing the same thing, the operator had replaced a target with a “generic” and the diode/leg orientation was different. Problem only showed up when the center trough switch was opened in game play due to multi ball. Take a real hard look around all the switches in that row for any “pecker” trails of solder, sloppy work, etc. Feel free to Pm me with any questions.

Scott

I think I was the first to point this out. Check my post “diode orientation”