LP Bug before maintenance

Hello, I played a game this evening and I just realised that I only won 13 LP. This is an ammount that seems pretty impossible knowing that my MMR is very good at the moment (Gold IV to Gold I in 1 week, skipping gold II). I usually win around 25, which is exacly the amount I won the game after the maintenance. Knowing that the maintenance was just after my game (I got the message during the end game lobby), anyway this could have somehow afected the LP I won?
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