LP Gains in D4

I recently got promoted to D4, in plat 1 i was earning +22lp for every win and -17lp for every loss. As soon as i hit D4, my lp gains and losses flipped and now I am earning +13lp, -20lp. This makes no sense as the MMR of the games doesn't seem to have changed and ive been winning way more games than losing since i hit D4. The lp flip was instantaneous after the promotion, wondering if this a bug resulting from your MMR changes at high elo in this patch.
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