Almost as if your kid always had it, but it was operating in stealth mode until now?
In fact someone coined the phrase "stealth dyslexia" to capture that very thought.
Here's a quote from
http://jimforgan.com/stealth-dyslexia-undetected-reading-problems/"Stealth dyslexia is form of hidden dyslexia. These highly intelligent and often gifted children compensate for their dyslexia because they learn to rely upon their outstanding memory, keen intuition, and general smarts to work around their reading weaknesses. Stealth dyslexia often goes undetected until the child is in fourth grade or older and then starts to struggle with reading longer and unfamiliar words that are specific to science, health, and social studies."
It's popped up a quite a few times here, too. Having the term "stealth dyslexia" you may be able to uncover a lot more.
