1993 Mariner 30hp ignition key off won't stop engine

[MrOtto]

I have a 1993 Mariner 30hp with a Quicksilver remote controller. Outboard has electronic starter. When I turn the ignition key off, the engine still runs. What usually is the problem and where to start looking for ground issues? I tried to replace the ignition switch assembly, but did not fix the problem, and the aftermarket part had a terrible quality key barrel cylinder that stopped working, so I put back in the original one.