That isn't a visual bug, just a large orange nebula in the background map that is making it look like that (if you spin the camera around you will see the nebulas edges). It is really big and really orange so I understand your comment, but it is working as designed.
I suspected it might be that, as I saw the background image change occasionally. Now that I move the camera around, I see that the "center" of the background image shifts around as the game is loaded.
Well, all I can say is that section is indeed VERY orange. Too orange for my tastes. Sorry. 
Out all of the sections of the background map, that one is the only one I find to be very oft-putting and bad for user experience. I might be alone on that one, but whenever that shows up, I automatically try to get rid of it, up to and including restarting the game.
If the brightness of that section can be toned down a bit, that might go along way to it being acceptable. But, then again, this might just be me.
