According to our narrations It was the Prophet peace be upon him who told people what goes where and which chapter goes before which. And our understanding is that during the time of the third they discarded all the compilations that included explanations and narrations and kept the one that we have today. That does not suggest that the order was different. It is simply the fact that narrators and scribes had additional explanations by the holy prophet peace be upon him and his progeny which the leader ship at the time did not like