Me and a friend made a subclass together that gives away a fighting style so when i sent him the link for the details page he couldnt see the fighting styles(options for the feature). Why cant anyone but me see the fighting styles of this subclass?

Because it is not yet published, it’s a system thing. One way to resolve that until published is to create a dummy feature that just lists all of those options at the end of the subclass. Just remember to delete it before publishing or your options will end up displaying twice.