MMR problem or what ?

in The last 20 games i played i won 16 and lost 3 and 1 remake , having a 6 win streak in a row followed by a lost then a win then 2 loses then 9 wins in a row , those 3 loses worth 6 games of winning , i get 16 -17 LP a win and lose 23+ LP almost MVP on every game. why is my MMR not going up ? or is it something else ? also i'm not sure if this is the right board to post this on.
Report as:
Offensive Spam Harassment Incorrect Board