This looks interesting. I tried to try it on the web version. But there seems to be some problem in typing the question itself.

I believe with the auto correct on, it is just predicting the word & repeating it. I wanted to type “Which” but it auto typed “WhWhiWhiWhic” something like that. Let me see if can share screenshot.

I think something do with auto correct & then pressing the back key to delete which again auto corrects.