@Stewie33 some ppl prefer being referred to as 'she' when saying smn like 'she said this' but prefer to be called as 'them' when saying stuff like 'it was them'. And on the other hand if a person that has they/her pronouns then that means they like being called 'they' when saying something like 'they did this' but they like being called 'her' when saying things like 'it was her' or 'that thing is hers' etc.
So it's all about preference and how a person wants to be addressed in different situations.
Imo I find this all very stupid and I believe that there are only 2 genders and everyone's pronouns should just be she/her or he/him automatically.