Flick Zero Calibration Issue

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Hi, I'm running Flick Zero on Raspberry Pi 2.
Generally gestures are detected but have some problem with Y coordinate shown in Flick Demo under python example.
When I move my finger accross X coordinate it is scaled from 0 to 1 at the end of board. It is OK.
When I move my finger accross Y coordinate it is scaled from 0 to 0.7 maximum which causes also an issue with Touch gesture. As a result it is hard to detect North. I need to touch side part of the board to get North and Y = 1.
Is is a problem with using Flick Zero with Raspberry 2 or issue with the my board or firmware?

Thanks in advance