Neautral wire overheating

I think it started out as a bad connection on the white wire side of the contactor. See how the lug is twisted left. In tighting the temrinal it should be twisted right at least. Righty tighty remember. loose lug or loose wire in lug started it. Send it back to Progressive and maybe they can rebuild it for you. I always use an anti oxident on all wires and I take the lug screws out and give them a little too. In AC current the load shows up equally on both wires. There is no plus or minus. This trouble was because of a loose connection somewhere right at the contactor. wire in, wire out, contacts themselves?