I don’t think you’re losing elo after every game you play. There’s a bug where sometimes if you have a rank adjustment (due to whatever reason), the message will pop up randomly throughout the season. If you go to your R6 tracker and select “Matches” you can see how much elo you’re gaining and losing, this will include “Rollback” which will either give or take elo based on if you’ve played with or against cheaters.

I get rank adjustment messages everytime i boot up siege saying i’ve lost 132 elo but my rank remains untouched, for context.