How Does LP work

So i'm a silver player, Zed main and very confused by the ranked system. When I am winning games getting an S from riots system I receive something around +19 Lp. This makes sense to me. What i don't understand is when I lose I lose 21 Lp. I didn't have comparatively bad stats for the game. Did not AFK, flame or anything else. Can anyone please explain this to me. {{champion:238}}
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