You probably need a neurologist to explain it rather than a typist. I assume you're going left index, right index, left middle, so you're trying to coordinate fingers that are two centimeters apart on the keyboard, but at least a couple of meters of nerve length apart. I get 'hte' a lot too. Always get the 't' and the 'e' the right way, because that's simple ordering down that arm - just timing the 'h' in between that's sometimes off.
I hate autocorrect! I know when I've typed something wrongly and immediatly, automatically backspace, by which time autocorrect has corrected the word and I'm halfway through deleting the correction! That's irritating!