Low lp gain despite high win rate

At the time of this writing I am p2 with around 71% win rate and about 45 games this season. I noticed that the further I’ve climbed the less LP I’m gaining at the end of games, to the point where I’m getting only 19 a win compared to last weeks 27. Is there a system put in place to intentionally slow down climbing, or am I climbing too fast for my mmr to increase in time (does that even make sense??). Has anyone had this problem before and how did you get rid of it? Can’t seem to find anything online.
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