Same joystick button for several VPX actions
What it means
The same joystick button number is assigned to several actions in VPX's settings. This may be intentional.
Why it happens
In VPX's legacy settings format (10.7 and earlier, in the Windows registry), every action whose button number matches runs when that button is pressed. The scan does not report a button shared only between coin and credit actions, or only between the plunger and the lockbar. The VPX 10.8.1 format (INI file) is not read.
How to fix it
If one button is not meant to trigger several actions, assign one of those actions to another button in VPX's key settings. Otherwise there is nothing to do.
How Pincab Toolbox detects it
At least two joystick actions in VPX's legacy settings format (Windows registry, "HKCU\Software\Visual Pinball\VP10\Player") have the same nonzero button number, and no standard VPX 10.8 "VPinballX.ini" file is present. The scan changed nothing.
Check your own pincab
Pincab Toolbox is a free Windows scanner for Visual Pinball X and PinUP Popper. It finds and explains problems like this one. No account, no telemetry.
Download for freeCovered: Visual Pinball X (10.x) and PinUP Popper. Partly covered, read only: PinballX and PinballY (their settings and game lists). Not covered: Future Pinball, Pinball FX, Visual Pinball 9 and the other frontends.