In compensated dyslexics (aka, stealth dyslexics), it is not unusual for reading to eventually reach a high level of proficiency, but for deficits in spelling to persist. Reading (decoding) and spelling (encoding) are two sides of the same coin, but there are more natural compensatory supports for reading than for spelling (e.g., the number of ways a grapheme can be pronounced is generally fewer than the number of ways a phoneme can be spelled; high-cognitive readers can use context to support decoding, etc.). Also, decoding real words is generally easier than phonetically-decoding non-real words.
