I suspect the user has a zoom factor applied to his display.
This causes a misalignment between the co-ordinates we think the window is located versus the real desktop co-ordinates.
The zoom logic in Windows basically converts the real desktop co-ordinates to 'fake' co-ordinates when reporting the information to us so, when we took the snapshot, the co-ordinates were off.
We addressed this in 2018 so you should find PxPlus 2018 Update 1 or PxPlus 2019 should work correctly.
PxPlus 2014 came out before the Windows versions you are using thus it would not have the logic to handle zoomed screens.