https://youtu.be/_bhEa2hF6Y4?list=RD_bhEa2hF6Y4

I know it’s probably a long shot, but is anyone here good with iPhones? My phone (12 Pro Max) seems to have a glitch where it artificially increases my storage every time I move some kind of data from it. It also happens when I try to make a backup or enable stuff like iCloud Photos. I’ve looked up and down the internet and while I find people with similar ‘phantom storage’ problems it’s nothing like what I have where it’s this consistent problem with the same thing.
Is anyone else familiar with this and what might be causing it?