I don't recall exactly when it started happening, but I've been having lots of issues with recent iOS versions rewriting not the last word entered, but the word before that. For example, if I start entering "I went to", it'll sometimes correct to "I want to", but it'll do that after I've typed the "to". I've found lots of similar examples. The retrospective nature of the edits mean I miss a lot of them and makes me appear a lot less literate than I am.