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I had a similiar thing happening. Did some rough calculations and found out system was only using something like 40gb for real, rest was some kind of bug
Have since switched to Evolution X rom and I'm very glad I did
I'm poor and my phone is 4 months old. I need a fix lol
Factory resetting the phone should fix it (this will delete all your data so make backups if you want to keep some things!). I'm not 100% certain though
Keep in mind that this bug will most likely reappear someday, maybe even sooner than later. So it might be worthwhile to look into custom roms if you're a liitle tech savy and/or willing to learn a little bit. This also is your only realistically achievable option if factory resetting doesn't work
I did a system update recently, might be some kinda of bug. It's either that or related to sd card.