wtf 10 LP

I havent been over s5 yet this season. I'm winning more than im losing. yet im going down by about 20-21 LP per loss, and, as you can see, i just got 10 LP for a win. I understand the LP gain/loss fluctuates based on your match history, but wtf. i won my previous ranked as well, and pretty sure i gained about 16 LP for it. Is there any other variables that im not aware of? do longer games earn you less LP? is it because i had to mute literally everyone to save my braincells? plz halp
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