Would it bother you - if this happened at your kids school? A 15 yr old boy (ok Trans) who used to race on the boys team - now races on the girls team and is beating the other girls. I don't see why it won't happen here - if it already hasn't happened.
I have kids at high school and i'd find this hard tovsccrpt, especially if i had girls who liked sport.
www.google.co.uk/amp/www.pinknews.co.uk/2017/04/08/trans-middle-schooler-added-to-female-track-team/amp/