Mac says I'm using more space than I have?

When I checked my storage for my Mac it says that I have over 200 GB in movies. First, I do not have that many movies. Second, my Mac can only hold 128 GB. How can I fix this?

Update: I just deleted a couple of videos and the storage space changed accordingly. It used to be 214.06 GB and now it is 201 GB.

Mac Hard disk usage

Screenshot of DiasyDisk contradicting what it says in the previous screenshot. Ignore exact numbers I deleted quite a few things last night (completely irrelevant to the movies).

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Regardless of third party applications, if the system drive information is showing file system inconsistencies, there are a few possibilities. Try each of the following in order until the problem is fixed.

1) Empty the Trash and reboot your machine in Safe Mode. Once you login, reboot normally.

2) Boot into macOS Recovery (command+R at the chime). Repair your normal startup volume using Disk Utility. While you can do this "in live mode" during normal operation, it's not as reliable as checking the volume from your recovery partition in recovery mode.

3) Reindex your drive.

  • Choose Apple menu () > System Preferences > Spotlight > The Privacy tab.
  • Click the Add (+) button and select your boot volume from the sidebar (sometimes under devices)
  • Wait 10 seconds. Select the same item and click the Remove (–) button to remove it from the list.
  • Quit System Preferences. Spotlight will reindex the contents of the folder or disk.

4) If (3) doesn't work, then forcibly reindex your drive from the terminal using the following command (admin privileges required):

sudo mdutil -E /