It's not a bug, here's an article explaining what happened:
https://support.chess.com/article/210-how-do-ratings-work-on-chess-com
Can opponent elo lose more than 30 point in 1 game while I get only 9 point?
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Can opponent elo lose more than 30 point in 1 game while I get only 9 point?
Well I know, the answer is yes because it happend to me.
In recent game, I won and got 9 points while opponent lost 37 points.
It doesn't really matter how the opponent's rating changes, but it felt like bug so I ask here.
If it isn't bug, may I get the explanation of why it happend?
(I do have the link of the game, but it feels like it is not proper to showcase oppoent's loss game publicly.)