Do you mean having seams between the displacements, dollar?
If you do, (and you should do this anyways) you should click on every face on the displacements you cant see while in displacement editing mode, then hit destroy. It will make all these non visible faces not be there, and will make all the seams between the displacements go away.
Those are the seams. Do as i said and they will go away - what they are is that those extra faces in the displacements are creating shadows where they exist, so deleting them makes them not cast the shadow.