We ran into this, had it checked and learned that one side reads a little less. That's why phones charge slowly and lights are dim, but appliances plugged in don't work. They blamed poor construction, like maybe a staple somewhere in the wiring. Makes sense, and now I'm done putting money into it.
PartyOf5 appreciating our Creator thru the created. 5 yrsL 50k, 49 states & 9 provinces.
May you find Peace in all you endeavor.