I found out what it was - drivers. Apparently, the latest 4070 Drivers weren’t really working with Unreal. Found it in a tutorial video of an Unreal master (Miguel Andrade on YouTube) where he just casually mentioned “oh, and do not update drivers for now since the latest ones cause Glitches with unreal. The best version is 552.44” - tried downgrading to 552.44 and everything is working fine. Leaving here just for others to know that it might be drivers sometimes!
Thank you all for the answers, I’m sure I’ll come back to bother you again, soon XD