Weird behaviour after changing the game to fullscreen.

Hi, new guy here.

I’ve been trying to make a graphic options screen for my game, and after adding options to change screen resolution and screen mode I’ve ran into some peculiar problem.
I test the changes in a separate window, and here is how the problemn appears:

  • first I change the screen mode to anything but full screen, changing resolution works as expected
  • then I change back to fullscreen mode
  • now changing resolution to a lower one gives me this:

the screen works like intended, only the visual gets broken like this. Here is the blueprint I use:

Is there something wrong with the blueprint? Or is it supposed to behave like that because its a fullscreen mode, and I run it in a window?