Teams randomly changing divisions

Does anyone know how I can stop teams randomly changing division? I have regional divisions set up and everything is fine until 2025 when, without any reason whatsoever, teams move divisions. Sometimes, they move up a level, despite there being no promotion or relegation. Other times, they can move to a league on the other side of the country (and for an amateur side playing in Canada, they will be crippled financially).

are you using a Mod? if so ask the person who made it

if not ask SI what is going on

I am using a database that I have expanded. The issue is only with 8 out of the 22 leagues that I have and it will always be the same leagues, whether I test in-game or in the editor.