Lost 100 LP in 2 losses

So i was in promos for Gold 4 when the divisions changed and when i logged in today i was gold 4 100LP and had lost 1 promo game( I lost it before the change). I play the game and i lose resulting in me losing the promos. But insted of being around 60 LP or even 50 cause my mmr is kinda terrible, I get to 0 LP. Anyone can explain?
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