menu position wrong on second monitor

first the component might be wrong but i did't find a better fitting.

the problem: when i use multi monitor setting, and i have the second one rotated so some part is over the top left corner of the primary monitor,
then when the application is in that part that is over the top left corner and i open the main menu or a menu popup it got moved to the place where the height of the primary monitor would be.

it does happen for all applications which does use QT like the QT Creator.

a screen-shot how that moved menu pop does look like is attached.