Elevation result is not correct

I tried this noon. The elevation result was not correct, it should be about 40cm. What is the causes? Anybody can help me.

Did you enter antenna height on the base mode?

It automatically entered, x,y,z.

Could you please show us your base settings?

Okey, I will post my base setting later after back from office soon. Thank you @igor.vereninov.

Today I try turn on base first until have a coordinate from single accumulation. Then turn on rover. I have same elevation (Z) coordinate. I think this is important, take base coordinate first until finish, then turn on the rover.