So I lost LP after a win?

Was just playing some on my smurf. After winning the game (yes i sucked, also my w/r stop bully me k thanks bye :D), for some reason I lost LP? I disconnected for 5 min max. due to internet issues. I mean, I don't really mind, cause it's just -16LP but Iam just asking why this happend? :o Also it says that I left the game, "Leaver" but I for sure played 80% of the game. {{sticker:slayer-jinx-unamused}}
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