why are my lp gains so shit

SavageCabbage55 - Summoner Stats - League of Legends
SavageCabbage55 / Diamond 4 11LP / 59W 35L Win Ratio 63% / Darius - 31W 15L Win Ratio 67%, Nasus - 9W 7L Win Ratio 56%, Fiora - 8W 7L Win Ratio 53%, Yasuo - 4W 4L Win Ratio 50%, Zed - 4W 1L Win Ratio 80%
I have a 63% winrate over 100 games and I was getting 25 lp per win all through plat. Once I hit plat 1 i started to only get 19. I was consistently gaining 19 lp per win in plat 1 but once I promoted to D4, I instantly started gaining 14. My winrate is still basically the same. Whats up with this?
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