The source gives a different outcome when the same words are addressed to a wife after consummation: three divorces in total, one from the first expression and two from the later one.
The distinction concerns the continuing legal subject of divorce. Here the second formula can operate as well, so the legal effects accumulate.
The same particle and wording do not guarantee the same legal result when the relevant legal circumstances differ. Linguistic analysis must be connected with the law governing the act.