unfortunatly i have big fingers, and have trouble with most keyboards so i make alot of unintended mistakes when typing, a big pain when in ssh or programming
and as far as your mistake goes, its because your are "new" to touch typing? (correct me if i am wrong) OR you are a experienced typer who tries to type TOO FAST
I am not new to touch typing, and I do not type too fast. As I say, everything else turns out right (apart from "u" on "you", but I think that is a speed thing and dosen't happen a lot).