When you open the game windowed, for example, at 1280x720 of resolution, and then upscale the window to 1366x768, when you take a Screenshot after doing it, the Screenshot will have a resolotion of 1280x720 cropping the extra pixels of the screen
Screenshot of the game at 1280x720 windowed BEFORE upscaling the window:
Screenshot of the game at 1366x768 windowed AFTER upscaling the window (GUI Out of Screen and off-centered camera):
PS: Yes, i know there's a mod installed (The INV Button below the map one) but i also try it without mods and the bug persisted