Get Correct Storage Information
Do not use the information from the Storage section of the About This Mac dialog. Ignore the Storage information as it is typically wrong. To find out the correct information for any disk: Select a Desktop disk icon. Press Command-I to open the Get Info window and look at the topmost panel displayed. You will find the disk information displayed for Capacity, Available, and Used. If you have more than one disk/partition then repeat for each one on your Desktop.
The categories found in the Storage section of About This Mac are simply an arbitrary way of displaying files on your drive. There are no such categories actually on the drive.
There is an "Others" data file maintained by macOS. You may also see space labeled "Purgeable." For more about this see What is 'Other' and 'Purgeable' in About This Mac? Do not confuse these with any of the artificial categories listed in About This Mac's Storage summary.