Are you sure you are not putting two surfaces in exactly the same place?

  If two surfaces with different textures are exactly in the same place,
POV-Ray has no way of determining which one of them the ray hits first.
The one it picks as "first" will depend on accuracy of floating point,
etc, and will be more or less random. (This is the so-called
coincident surfaces problem.)

  Don't put two surfaces at exactly the same place. Separate them
a very small distance.

-- 
#macro M(A,N,D,L)plane{-z,-9pigment{mandel L*9translate N color_map{[0rgb x]
[1rgb 9]}scale<D,D*3D>*1e3}rotate y*A*8}#end M(-3<1.206434.28623>70,7)M(
-1<.7438.1795>1,20)M(1<.77595.13699>30,20)M(3<.75923.07145>80,99)// - Warp -

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