Is it possible that these combos are equipped with three-way switches, and not a break-tab terminal for separate feed of switch and receptacle??
The two screws on the left hand side of the device are black. The ground screw is green, the upper right screw gold, and the lower right screw silver...
I agree with the panel so far - I bet there would be continuity between the gold screw and the small hole, ans also continuity between the silver screw and the larger hole.
If the continuity is reversed, then so is the device (duh).
Just an idea.
