I just changed method and the distance changed?

[Mssadg]

Is it because some settings wrong?

[Mssadg]

I think the original distance should be the same

[DPI Wizard]

The text is a bit misleading. Monitor Distance Vertical is showing the vertical distance from top to bottom, while Viewspeed Vertical is showing left to right. It might be a bug that Viewspeed Vertical is showing the horizontal distance and not the vertical, I'll have to look into that.

Either, this does not affect the actual  calculations as it is displayed just for information.