So I am not sure if this is on purpose or not, but on my Gottlieb Super Mario Bros pin, whenever Luigi's Cave Count-up mode is on, I can shoot the cave and it works, but it seems to also register when I shoot the far left pop-bumper. I'm not sure if the switches are meant to be interchangeable from a gameplay perspective (maybe its a thing you can disable by setting difficultly of the pin to hard), or if the switches are electrically connected by accident, or if the vibration from a firing pop bumper causes a badly gapped switch to connect.

Does anyone know what the proper behavior is? At first glance I'd think something is wrong because the 'shot' becomes way easier with two targets and the left pop bumper is an easy shot.