I am not an electrician but what little electrical wiring I know it seems per your photo you have two neutral wires (white) connected to the bronze connector (hot). I was told that outlets have a bronze screw (hot) and a silver/chrome screw (neutral) (one pole). A two pole would have two bronze screws (on one side) and two silver/chrome screws (on the other side). I could be wrong.
When I install electrical outlets in parallel I use the two pole outlets.