My drive C only has 2 gb free left when its actually has 30 gb left

[Microsoft Windows]

So i have an ssd for my drive C system it has 232 size, yesterday i moving file around 10gb+ and have a free 16gb c drive but suddenly i lost almost half of it and it became 8gb, i try system restore hoping maybe its gonna fix it, its just make it worst after the restore its done it became 3gb free. I try folder size to see whats happen and it didnt show any new file that can cause it, the biggest file i found that created on the day it happen only pagefile.sys. since i cant found the problem with folder size i calculate the size manually, after adding all the size of the folder on C drive it

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