Div 3 Difficulty??

Yesterday evening I lost 12 games in a row in division 3 having taken the lead in most of the matches. The 2 days before I won a total of 2 matches-  I just don't get it - I won every match in division 4 easily and now I can't win a single game. It genuinely does not feel real. Even if it is, this is some nonsense. 

Another thing, I nearly always beat the "big trouble" teams but I can't get more than 9 wins in Champs. This year the game feels fraudulent