Touch screen wrong coordinates on touch

Hello,
I have a problem with touch coordinates for the QEvent::TouchBegin (QEvent::TouchEnd and Update is ok) I.e.:

Code:

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const QList<QTouchEvent::TouchPoint> touchPoints = static_cast<QTouchEvent *>(e)->touchPoints();
            touchPoints.first().pos().x // <- == 0

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give X always 0, Y is ok.

Any one knows the reason?