Visual Artefacts in Options window

Visual Artefacts in Options window when Qt Creator is built with Qt 5.

Issues:
1) The Window cannot be resized
2) The height of some of the controls are not correct, check Android page or spin boxes in Debugger page/ Version Control page (Git tab)
3) The section Header fonts are smaller then the Body text font For eg: "Use Debugging Helper" in Debugger page etc.
4) Also Drop down menu in Build/Run Settings. Check "Add Build Step" and "Add Clean Step". However, "Add" (beside Edit build configuration) is displayed correctly.