Interesting question--I'm looking forward to answers. My daughter had the opposite issue when tested with the WJ-III. Her verbal scores are very high, but her processing is low. But, for my daughter, her calculation scores are much lower than her verbal, so I figured that it had to do with domain-specific stuff.

Stacey. Former high school teacher, back in the corporate world, mom to 2 bright girls: DD12 & DD7.