Backquote (<) and ² inverted on my external keyboard
I've got the same problem on an external Italian Keyboard, as said in the comments by Tom Gewecke the problem was Karabiner.

I want to maintain Karabiner for one of the two keyboards so I've done a "simple modification":



You can do the same with your inverted keys.

Another solution of the problem is disable Karabiner for a specific Keyboard: