When moving the GUI buttons to different parts of the screen, the positions of the buttons also move when you switch the window from maximized to the original window size.

IPN GUI not maximized and no buttons moved:

IPN GUI maximized with a button moved:

IPN GUI not maximized with a button moved from the maximized window state:

the 2 top left buttons position is relative to the 0,0 coordinates of the screen.
in contrast the other buttons positions are relative to the 0,0 of the shown window.
this is why there is discrepancy when the scaling changes.

I'm not sure if I can do something about that

at this point I won't adding such functionality