rapid drop in ratings
Did you google Glicko RD, as I suggested?
The higher your RD, the more points gained or lost in a single game.
Low RD players would gain perhaps 8 points by beating a player of similar rating.
My RD was rather high, and I gained 108 points from this game:
https://www.chess.com/forum/view/game-showcase/a-heroic-defense-in-the-sicilian-najdorf-kids-dont-try-this-at-home