> i see it is before the word, i let go, and the cursor moves to the end of the word. if i wanted it at the end of the word i would have put it there before letting go.

Having never implemented something like this, I wonder if the algorithm could take into account how long the cursor lingered on each position before being let go. If it spent significantly longer in a position before the word, and your finger happens to move a little bit when you let go, that slight movement shouldn't affect the cursor position.

Apple is usually pretty good about this stuff but they've really been slipping on the keyboard.

I dont think it is a last second twitch. It's some kind of autocorrection that has decided I meant to do something differently than I meant to.