Need help understanding ChairGun windage chart.

Not sure if General is the right place for this, but starting here. 

I really need help to understand something ChariGun is showing, which I have actually seen in practice as I was shooting this afternoon. Usually I shoot indoors at 13 yards, but when the neighbors aren't looming I get to shoot outdoors in the 40-45 yards range. What I have been doing is sighting in at 13 yards and then trying to work with ChariGun to get an accurate adjustment for the 40-45 yards shooting. Getting an accurate sight height seems to be one of the most important criteria in ChairGun as far as elevation clicks goes.

I usually profile for 0 wind and then compensate as needed. But the windage with no wind shows this arced path of travel right and then left as the pellet flies. And the offset of .3" at 42 yards is almost exactly what I saw. At 13 yards the gun is spot on with windage and then, since it's a pistol shooting slow, you can actually see the pellet go a little right and then come over to the left. Today is very calm here - no wind at all and this was repeatable requiring a little windage adjustment. 

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Can anyone explain if this is accurate. Is what I experienced normal? If so, is it more pronounced at slower pellets speeds?

I've never seen this discussed so help me understand if it is something or nothing.