What was happening with the original wiring. Did you turn it on or did you check here first

I’m really not sure what was going on with it. I just happened to be looking in the back box and noticed one of the wires half hanging out of a connector. When I checked the other wires around it, they were all lose too.

 From what I could tell both connectors had been changed at some stage and little tabs on the connector pins which keep the pins from falling out of the connector had been flattened so the wires just slipped in and out of the connectors. At some stage some of these wires must have come out and they’ve just been sat back into the wrong location.