the cables are reversal and the dock would usually be used in the same orientation each time
if the connector is half defect and the cables you have attempted to connect connects to the dead part
and the dock to the working part that could explain it
try connecting the cable the other way around
if that don't help then maybe the dock is a bit thicker in the connector and the defect gotten a big loose connector gets a connection with the thicker connector and not with the thinner cable