you probably meant it as
"because most administrative staff are female, male interests are underrepresented at the highest level"
I cant really argue with it because i've honestly no idea which male interests could possibly fall short in the context of a school, but anyway.
your phrasing of the initial statements comes across as sexism, because it sounds more like: "only males can represent all students interests"
you probably didn't mean it like that, but that what it sounds like, tbh