MMR and LP gain

Alright, so I just finished my series into Plat. 3 and played the first game, lost, and was like "It has been a while since I last checked my MMR (using OP.GG) I wonder what it is." So I went and checked, and I am about -200 MMR away from what I am supposed to be, yet I am gaining around 1923 LP per win, -1322 for a loss. What's up with this? oO