Google drive shows wrong used space

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There are no backup partitions or unallocated partitions in disk management. When I check all files and sub folders it says they're total size is approximately 500 GB.

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When I click properties on this folder, it says it contains 500 GB of data. I have one folder saved with many sub folders inside of it entitled 'shared'. Can someone explain this to me? I have a 1 TB Samsung HDD and it shows I've used 700 GB and have around 250 GB left. My hard drive properties say I've used more space than the properties of all my folders save to the drive.