I tried pretty much everything to solve this, spent hours but I can't come up with a solution to what the hell is going on so my last resort was coming here to ask.

Basically, I downloaded a few free games, where winds meet and Palia. I played them for 30 mins or so before noticing something, my C disk drive previously having 20GB free now only had 7GB. this had me very confused. nevertheless, my brother solved the issue and freed some space so it had 27GB free now, I thought itd be end of that but nope.

While playing where winds meet I noticed something, anytime I boot up the game, the game takes space in C disk instead of D and it takes A LOT of it. To boot up, it goes from 27GB down to 24GB, when I leave it goes back to 27. But, as well as when I leave after some gameplay 100-300+ MB is reduced from my C disk and this goes for any steam game I play, even Palia. My disk space right now in C is 23.9 GB after i tried to resolve the issue and unsuccessfully so. Anyway, I asked a close friend is this happened to him but it wasnt the case so I'm not really sure whats going on for this to only happen to me. Am I doing something wrong or?