Pre-flight altitude is not stable to zero

when I turn on my drone I notice from MissionPlanner that the altitude is changing ±2 meters (so it is going from -2m to +2m) with time, even if I don’t touch it. Is there a way to reduce this error? maybe with a particular calibration?
I would like to fly indoors with a max altitude of 2 meters and this error is not helpful.

That altitude is reset just during arming. So you can safety ignore that drift.

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