There's no limit level in this game, simply there's the seasons that one played as manager (31 and 42 in the pictures) and the league level, 31 in this case.

Sometimes the Top Server don't have enough teams and repeat the same League Level, thats why a level 42 team is in a level 31 League.

Too can be possible that this manager did a take over, and leave the original club to play in one of lower level.. but I bid for the 1st option