Not to discount your possibility, but interestingly enough it's possible there are bugs in the mapping data. See http://testoptimal.com/ref/starwest-2006-mbt-t

Not to discount your possibility, but interestingly enough it's possible there are bugs in the mapping data. See http://testoptimal.com/ref/starwest-2006-mbt-tutorial.pdf http://testoptimal.com/ref/starwest-2006-mbt-tutorial.pdf, page 99 for a neat example. It's sort of ironic, I remember reading a much more in-depth paper from Harry about this specific work, but I can't find it. :-/