Knot thet ive eva notised.
Sorry! Seriously, I don't have that problem, but my other half does. His handwritten stuff is fine, but some of his spelling on typewritten documents is dreadful. I think part of his problem though is that he has never learned to type properly so has to look at the keys rather than at the screen.
You've also got to differentiate between spelling errors and typos. Every now and again I do make typos when one hand works quicker than the other. My usual ones are teh (the), adn (and) and thsi (this).