Man...is just a new bug or something??? I was playing only ranks etc i go to promo 100 LP i win a game 1 W and i have 0 L i lost a game and i faild my promo with 1 W 1 L at S2 wtf is this??? im super mad right now ...no rly just search my name 1Leu2Lei and lock i playd this day 4 games 3 W 1 L and sill faild the promo?? ( not the best english ever )
Did you dodge one of your games? Dodges in a promo count as an automatic loss.
https://support.riotgames.com/hc/en-us/articles/204010760-Ranked-Play-FAQ#h6q4
No...i play this game every day 3-4 games i just start a game next another etc etc 3 wins and the 2 win was the 100 LP points start the promo 1 another and lose next bom i was like ok i have one more game...i was sad wen i se u uncomplete the promo or something like that... 
