I don't lose rating

I often lose around 5 rating per lost match and win around 20 rating per won match.
I didn’t even lose any rating last 4 matches.
Then I win a game 2v4 (was still extremely hard so unbalanced matchmaking) and got +20. How come I lose very little rating after getting completely crushed but win a lot of rating after a victory? Doesn’t seem right.

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