I think you are facing a power issue within your buildings wiring! You’ll need to get a AC outlet tester [https://www.homedepot.com/p/Power-Gear-3-Wire-Receptacle-Tester-50542/206212329?|3-Wire Receptacle Tester] here’s more on why [https://www.youtube.com/watch?v=AvLf-xPCg-U|A MUST HAVE TOOL - The Electrical Outlet Tester - How to use and why you should have it] I’m suspecting you have a hot ground![br]
The other possibility is the Thunderbolt display power supply has a short to ground.