Due to technical issues caused by the recent server migration, some leagues created since the migration have been closed and we encourage the hosts to re-create them. We have taken the decision as a precautionary measure against a butterfly effect occurring within the data of any leagues made in that time. None of the leagues had more than 4 people in them, and the vast majority had either 0 or 1 person (the host). As such, the general consequences should be minimal to the community as a whole.
Just ban creation of league all together to aid people who have started leagues and are struggling to get new people. You could even make a rule where you can only do 20 races before making a league.