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Hi, I'm Mike G and I'll be glad to assist you. The thing to check is the setting switches on the photo/ motion sensor. If a change there doesn't resolve the issue, the sensor is defective. Having or not having a ground doesn't affect operation.
With all the items made in China, getting bad sensors is very possible. You have 120V, have it wired correctly, so what else could it be. Return them as defective.