Yeah, that is really weird. It recognizes D-Pad "Up" as "LEVER UP" in configuration with the Anbernic RG P1.
D-Pads on my Xbox controller worked as did the one on the 8bitdo "SN30 pro".
On the 8bitdo M30 it didn't work and it recognizes D-Pad Left as "LEVER UP", doesn't let me use the other directions.
Pretty weird all in all. Luckily I have options.