Is this a bug? heroes of the storm ranking system

I don’t know if this is a bug or not, but I dont think it is fair…. I will add a picture when possible (first time posting)…

My situation is that on the ranking system I have 76.2% win rate, with 16 victories and 5 defeats, the problem is that I am getting between 18 and 50 points on each game and I’m rank B5 (the lowest)…. I know this is not how it should work because my friends get between 200 and 300 points on each game.

11 visit t-rank. com