I never experienced this and it doesn't really make sense.
I installed recessed lights(6) with the switch. I connected them all in parallel. The house uses only two wires for lights, white and black. I connected all ground wire and connected it together. I also tried to connect ground wire to every metal box so it's all grounded.
When I turned on the circuit breaker the lights were ON bypassing the switch. The switch was connected correctly interrupting black wire. The only logical thought I had was that the live wire is white and is trying to go through the bulbs into the ground. So I disconnected ground wire in the main box and that worked. But it still doesn't make sense because bulbs aren't connected to the ground wire. They are connected to white and black. Their box is connected to the ground wire.
Does anyone has any explanation for this?