Have you looked at where the bumper skirt contacts the spoon switch?
If it's misadjusted to where it stays closed, it would lock the coil on.
It could be adjusted fine, but dirty and that friction is causing it to stay closed and lock on the coil.

I would start by inspecting the spoon switch while activating the bumper skirt with your finger. If you do this while in the switch test mode, it should let you know if the switch is staying closed.

Doing this will point out the problem or eliminate the switch as the problem.