Hi, Are you using Time Machine, If so you may have local snapshots of them store locally on your Mac. (This is the issue I faced when installing) Try this Quoted from https://support.apple.com/en-gb/HT204015 "If you want to delete local snapshots manually, turn off Time Machine temporarily: Open Time Machine preferences from the Time Machine menu  in the menu bar. Or choose Apple menu  > System Preferences, then click Time Machine. Deselect “Back Up Automatically” or click the Off/On switch, depending on what you see in Time Machine preferences. Wait a few minutes to allow the local snapshots to be deleted. Then turn on Time Machine again. It remembers your back-up discs." That that does not work try deleting it manually in the terminal. Type tmutil listlocalsnapshots / You should be presented with something like this com.apple.TimeMachine.2020-06-01-002010 (the number will be different) If this appears Type sudo tmutil deletelocalsnapshots 2020-06-01-002010 (substitution the ID presented before) Hope this Helps