Just lost 10 LP for dodging a game wtf

As the title says,i dodged game for the first time in forever cuz we had a bad team comp so i rather lose 3 lp than waste 30 minutes and lose 15lp and worsen my MMR. Just how do u lose 10 lp for dodging a game 1 time.And ye im sure i lost 10 lp,i guess it can be checked by riot easily. With overall state of the game i guess i shouldnt be surprised with all the bugs and problems..
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