Mmr help please

I am a b5 player queuing with a s3. When we win or lose I get +/- 25 and he gets +/- 200. Why am I gaining and losing so little rank points compared to him?

Because bronze players must play so many games,learn to play ,increase game skills…so…on…so in…MMR points work normal way.
Other question ,if you lose more poits than won points games…,win rated is increased…master had over 70 ,other leagues had about 60 win rate…

But about 5-6 games prior i was going +/- 200