@JeffGrigg @Wifiwits @LilahTovMoon That post has plenty of comments pointing to the wall connection possibly being wired incorrectly - and that makes some sense in the installer mixed something up.

There is a GF interrupter in the wall connector that should trip well below the hazard level - that's why you don't die when your kitchen or bathroom appliance cord fails and you touch it.

All that's out the window with an incorrect install.