Solved

Please activate promotion

Sorry, I don't think it's a problem specific to your league. I have noticed a few bug reports recently where automatic promotion isn't happening. The Devs are aware of the problem, meanwhile the Support team will manually promote/relegate as required when this bug hits. 

Unfortunately you're nearly half way through the calendar so it is too late for the Support team to intervene and fix the problem this season.

Keep an eye on the promotions at the end of the current season, if it does not happen please immediately report it so that Support can manually promote within the break between seasons.