All my ranked points have been removed?!

So because of exams and revision i haven't been able to play league much but i do play about once or twice a week. When i played today (and won) i realised that i gained 18lp from 0. But last time i played (17/03/19) i was on about 56 league points. In a space of a week i have lost 56 points from inactivity? How is this possible?
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