Thanks! That's exactly what I'm trying, I quit Karabiner but I still see some process running (karabiner_grabber, Karabiner-EventViewer, Karabiner-VirtualHIDDevice-Daemon, org.pqrs.Karabiner-DriverKit-VirtualHIDDevice). I'll try uninstalling and see if that makes a difference.
Edit: one more thing that's simply not working right now are the Fn-arrow key combinations for Page Up/Down, Home, End, or to change Backspace to Delete. I'll update here if uninstalling Karabiner fixes that as well.