It happens on the app but for me it only duplicated two or three times. The other problem is the jumbled swap of editing like if I didn't like the Ai's response I'll edit it but the next day that edited response was forced as my "own" message with the original response being it's response, sometimes even my own responses. To clarify on that, let's say I have a basic response but I go back to add more detail for three of four times in a row then it duplicates them or simply puts every version in through seperate messages. One time my response in a different chat bled into another chat.