Why am i getting less LP ?

So im gold 3 rn and i have 16 wins more than loses (I dont really know if that matters) and for some reason im getting 16-17 Lp after matches and im losing 20-21 .. Why is this happening? i used to get 20-21 and lose somewhere the same. Here is my accounte if u wanna take a look. https://eune.op.gg/summoner/userName=HailDarkthrone
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