LP logic

Sooo,after having a huge winning streak on ranked suddenly i lose a game and there the stupid logic comes,from the games i won the average lp i was getting was 14 - 17,i lost 1 single game and boooom -21 lp!!! Had very good score,many ganks,many wards on the jungle( from me) and still have this massive drop.Like i wanna "level up" my division and the system wont let me...Any body knows why is this happening? I mean if i do something wrong tell me to fix it on my games,so i wont lose so much from 1 lost game.(sry for my english)
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