You may want to check out the Eide's section on Stealth Dyslexia in their Mislabeled Child book. They used to have a good summary on their website but the link is no longer valid. You could also look at Sally Shaywitz's Overcoming Dyslexia. They both discuss how dyslexia manifests very differently in gifted kids. I have no idea whether any of this will apply but it might help you gain clarity.