Small QDialog position after orientation switch

Preconditions:

Application includes small QDialog with animation & QLineEdit. Dialog is displayed at the bottom of the application screen area.
Tested with Qt Example application: Wiggly.
Dialog is open on portrait mode. Split view is open (with alphanumeric keyboard).

Test steps:
1. Change the view orientation from portrait to landscape.
---> split view is opened on landscape mode.
2. Change the view orientation from landscape to portrait.

Expected result:
Split view is opened to portrait mode and the dialog position has not changed.

Actual result:
Split view is opened to portrait mode and the dialog position has changed (it has 'jumped' upwards on the split view screen area).
If split view is closed, the dialog position is still wrong.