I am not able to remake your error without specifically assigning a hatch to the window object. And you don't seem to have any hatch, with lines, assigned.
It might be an object/library error. In section view, a small piece from the bottom of the window is missing. Go to 'Library manager' and refresh your library - remove + add it back again.
It might be an viewmap problem. Check that the settings are correct.
It might be that your window is assigned to another floor.
It might be because of the wall settings; check floor and floor plan display.