X2.1 and M8N Compass Error?

Hi, sorry for the noob question, but In Mission planner, How can I identified all the different MAG present in my system. My understanding is that I have 1 MAG on the X2.1 and 2 on the M8N. … maybe I am wrong… please Help me. Everything is fine, except for Compass Errors…
X2.1 and GPS are mRo hardware.

On Mission Planners HW ID screen after connecting.

Good day, what kind of compass error do you have?

Be shure both are pointing in the same direction, I disabled the internal one

… just notice the HW ID screen… thank you!