Yeah, your over thinking this. It's just a series circuit with a break somewhere. Just find the bad lock part or wire and replace it. And most certainly remove any jumpers or extra wires you ran... the issue is most likely in a Door lock or a wire inbetween floors locks. This is why I said it'd be easier to pinpoint with help so the jumper or bypass switch can be taken off so it's not backfeeding both sides of the lock circuit