Either there’s a difference between ?? ?????? and ?? ?????? ??????, or our ?????? was already between the ??”? and ???”?, and ?”?. I prefer the former explanation.
I’m also not sure that the ?”? means “chumra” the way we use it (optional).
I agree that we don’t use the term ?? ?????? (or ?? ?????? ??????) for a clear cut din; the ?”? might just mean that it’s not up for judgement.