I've had a good long look but I don't see any bumpmap problems. The blue bump
does indeed appear to be the reverse of the others, but this looks like a
normals issue to me, as Tim mentioned. I see no 'sideways' distortion at all,
and all the coloured bumps appear to be consistent between the various copies.

Apart from the direction-reversing, this looks perfectly fine.

There is, however, a problem with your vertices - assuming you were trying for 8
squares per quarter-face, these vertices aren't correct. Some of the vertices in
the coloured squares are off-line, producing a chevron-like indent on many of
the quarter-faces. I see this clearly in the image too.

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