Looks to me like the case of overlaping surfaces. When you have 2 surfaces that are parallel with tiny distance between them or they lie on same plane software dunno which to show "on top" so you get that crapy image. Seems you have one brown and one white surface there.
You have a decal applied. The Graphics card is unable to determine which surface should be in front because the values are identical. If you don't want to see this: create a new surface .001 inches (or metric equivalent) above the model surface and apply the decal to that.