I was gaining +22 LP and lost twice, then went 9-2 after and all 11 games were +15/-20 LP

I lost two games in a row, one for -16 LP and then other demoted me to Platinum II 75 LP, which means that my MMR isn't low. I then won 9 games and lost 2. All 9 wins are +15 LP, regardless of the fact I was gaining +22 LP before I demoted. Both losses were -20 LP, regardless of the fact I was only losing -16 LP before I demoted. What the fuck is going on here? At the very least, I would expect my LP gains to increase from 15 after going 9-2.
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