MMR Calculcation not working properly

This has to be a bug. How is it possible to lose more than 50 MMR every lose and only get like 1-2 mmr per win… im low mmr 4,5k. with nightelf. Also balanced teams are not the case… there is most times a huge MMR difference between the teams in 4v4.

Also when I take a look on the ladder, I actually now sit there with now 4.3k MMR (in total I lose 400 MMR today with and 70 - 39 while others have only like 10 games that ranking about 1800 - lol. How does this actually work?

Please fix.