placed in plat 4 currently 11W-2L only gaining +13LP

Hello board users, I have a question pretty much my title explains. I have currently 11 wins and 2 loses, but in the past 3 wins I've gained 13 twice and the last game I only got 12 LP. Anybody has an idea why these lp gains are so little? Is my mmr so bad? even though I only played solo and only lost 2 games which were in my promos?
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