How does lp gain work again?

I mean let's say you are gold 3, if your mmr is below average you should get less lp per win right? and if it's above average, you gain more. Over all these years in my experience, as long as you gained 20+ lp your mmr was good, maybe even slightly higher then your rank. This season it's different? I mean look at this: I gained 23lp. But look at the rating of everyone else in my game: I was one of the highest in rank which should suggest I have bad mmr no? So why do I still get 23 lp for a win?
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