Error with displacements.

Hey guys,
I am trying to make a map with a displaced path. It has small hills around it, then a lower portion that makes the trail for people to walk on. the only problem is that Im getting what looks like a shadow in that path. It is darker than a shadow and more pixelated though. Below is a picture of the problem. Anyone know why that is happening and how I can fix it?
Thanks and God Bless,
ArK

LINK TO PICTURE

there is nothing intersecting the brush.

I fixed it, thanks guys. It seems my skybox had a piece that overlapped it.