QDoubleSpinBox does automatically steps up/down after mouse key press, move out and release.

QDoubleSpinBox is using in QDialog. FIRST action after dialog opening is mouse key pressing on spinner, moving out the spin box and releasing the mouse key. In most cases the spinner value is increasing/decreasing automatically until I click on spinner again. There is in infinity loop called QAbstractSpinBox::timerEvent, then stepBy method. I'm not using timer anywhere. Call stack screenshot is attached.

If I click somewhere in dialog and then use the QDoubleSpinBox, bug does not occur.