I have a similar configuration and a similar anomaly —— though it is completely harmless. In my case, the menu is scaled up, but the mouse active hotspots are fixed for the smaller text (or vice versa, cannot be bothered to check right now). I do not have the blank area above, however, and it doesn't affect any other part of the game.

It didn't happen before this monitor (Full HD 1920×1080), when the game scaled down to fit an almost-HD monitor (1600×900px), which also forced the rendering engine to zoom in on the scenes.

At a guess, I'd suggest it is an incompatibility between nVidia GPU and the monitor, therefore (in my case: definitely) that would be fixed by a driver update (eventually).

Does this affect anything in the game —— i.e., besides the static backgrounds? If not and in any case I expect the problem is driver-based and only will be solved when nVidia refresh their drivers.