When switching from a 2 division league to a 2 subleague league so from 8 teams in two divisions to two subleagues with 16 teams in 4 divisions. The AI changes the championship report on the front page of league history and lists incorrect league champions. Instead of bolding correct champion it lists runner up as well. It also incorrectly lists playoff seeding expansion through previous years when league has just implemented new seeding to support new teams.
This was a problem in OOTP15 too.
So for instance as opposed to how it normally shows after expansion it shows as such:
Also after simming the year after implementation it doesn't fix itself. Is this a known problem?