MMR not increasing

So here is the gist of it. I played today starting at d4 0 lp. I won 5 games and placed 4th 3 times. I lost in 8th twice due to really bad rng. I didn't have any 5th 6th or 7th games. Yet somehow, i have only gone up to d3 0 lp. I am playing against people the same rank as me, so why am i getting 35 lp for first place but -65 for 8th?
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