You have a sharp eye, Jon. I reduced the max scales of the color fractals to 100. Don't really know why, it seemed 1km was a bit big for patches of color. I'll set them back to 1000 (or even more).
There's more work to be done. As my initial maps are quite rough (2000x2000px) I had a hard time getting the dirt roads alright (also used a color adjust and the measure tool to get them the width and hardness I needed), but the paths on the heathland need a larger resolution, so do the ditches. And more buildings needed, sheep, cows, horse-drawn wagons...