Qt Widgets Application on Android Not Working

[mykingdom13]

I'm using a Windows 7 host and trying to run an Qt widget application on the Android 4.4 device.
The GUI on the Android device after deployment seems got squeezed severely.

As my attached picture, the data/time picker is not recognizable at all.
The GUI looks like totally abnormal.
Even if I simply put a push button on it, it has same behavior.

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Added after 13 minutes:

The weird thing is that all the GUI shows correctly when I'm deploying Qt Quick Control based application.
I can't figure out the reason.