Acer ConceptD 7 Ezel Pen Parallax

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Hi guys, I just purchased an Acer ConceptD 7 Ezel Pro and found some parallax near the edges of the screen. On the center of the screen, there are no/minimum parallax.
I tried calibrate it many times, but there are not much difference because the parallax offset is not uniform across the screen. The offset becomes larger as the stylus move away from center towards the bottom. Here I attached image of the parallax.

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Any conceptD 7 Ezel owners can confirm that does such parallax exists in you unit too?
Many thanks