Im losing 22 LP and only gaining 18?

So last month i was bronze 4 and i started grinding ranked and now i am silver 3 with 119 wins and 105 losses. I duo a lot if that maybe has something to do with it? I have read that if you lose more lp than you gain the game thinks you should be a lower rank than you are , but how is this possible if i am winning more games than i lose?