There is a glitch in the LP system

Well, let me explain the glitch clearly to make sur everyone understand. I am Silver 4, I have 59 LP and I only win 6-13 LP per win's. Does it make sens!?

Before I continue about my problem, let me tell you guys that I understand the mmr system very well and it really has a glitch in it.

It is said that I have an MMR of 1,204. And if I take a good look at my matchs history and my KDA ratio, it don't fit at all with my MMR. Here it is: http://na.op.gg/summoner/userName=novergsens

That's the glitch. I have more wins in the last 20 games than defeats with high score. Does it make sens? In my opinion, I don't think so.

Because it says, improves your gameplay's in-game. That's just what I did in th last 2 weeks LOL, and I already main Vayne with BIG KDA and win's. But still winning 6 LP or 13 maximum. I already won 15 but that was just one game with an horrible KDA.

So, I want answers please!