Im wiring a residential home. There are two breakers 11 is feeding the lights and 7 is feeding plugs. With 7 on and hot wire tied in with the other hots from circuit 11 on of the hot wires gets 100 volt to ground From both the hot and neutral but 0 volts from hot to neutral. When close the path to the lights with the circuit to the lights off. The voltage to ground on the romex in question is getting 40 volts. With just the circuit to the lights on the romex in question gets 0 volts to ground. It sounds like they have a ground fault somewhere that’s not tripping possibly from being tied to the neutral or the egc is not connected to the panel? I’m looking for suggestions on likely solutions to the issue.