Hm, I still can't repeat that, whether fullscreen or windowed. Same exact situation, works normally...
Maybe you have some other settings enabled that are changing behavior or something? I guess I could try the same with your config info.
The only other thing I can guess here (based on your screenshot) is that once you reach those "visible cells" you're talking about, you're also eventually panning around the edge of the map, which isn't allowed to be panned such that more than half the view is empty, although you can still continue moving your cursor at that point, which could potentially result in a jump if your cursor then changes direction or comes back somewhere else, though it doesn't quite sound like that's what you're describing, especially since your second screenshot is centered over the other cell...
Can you repeat this on any map in any situation? Or only certain places? Since that could be a reason I can't repeat it, dunno... If you can't then I guess I'd need a save to see the specific situation.