12 LP on win? (Diamond 3)

So i was diamond IV 3 days ago and started playing duo with a friend (he is plat 1). When we started i was getting like 13 LP per win and after 11 wins and only 2 defeats im still getting around 12 LP on win? Why does this happen? Even if its an MMR issue i just dont understand why it didnt get any better after all these victories. Thank you for your time. Edit: Just lost one game and lost 20 LP i seriously dont get how that is possible. 54% winrate with 13-14 wins in a row and it goes like -20 on defeat? By far one of the worst systems i've ever seen.
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