With some people, there is some sorta disconnect between what they are thinking and what they are typing. They may think and speak correctly but type the wrong thing. I remember speaking with someone who would say 'shutter' in conversation but online, would consistenly type 'shuttle'. :dunno:
My GP teacher hated the way I spoke (/speak). She said my spoken English is terrible. Two different modes lah. People-to-people, I speak the england actually is quite terrible one.