Terrain Humps in view

[Bduerr]

I keep getting some strange humps and bumps in my terrain. Even when I make p-line shapes and set the area inside the shapes to be flat to cover certain areas they still show up.

Below is a view of an area under a deck. Note the green grass climbing up the retaining wall.

The bottom of the file shows the ghost images of the retaining walls and the elevation line shapes I have used to cover the areas and get them flat. Up near the house I literally had to use overlapping shapes to get the humps and bumps to go away.

As you can see by the purplish lines I have made the elevation change take place inside the walls, yet it still shows up in front of the walls. Any ideas?