I have an idea.
If a crossed neutral (grounded conductor) is unlikely. I would check for a neutral to egc connection.
Kill power to all affected circuits, disconnect the grounded conductors at the panel, and check every receptacle outlet to ensure you don't have continuity between neutral and ground.
If a crossed neutral (grounded conductor) is unlikely. I would check for a neutral to egc connection.
Kill power to all affected circuits, disconnect the grounded conductors at the panel, and check every receptacle outlet to ensure you don't have continuity between neutral and ground.