My World book 1TB say 198 GB free. Folders add up to more than half that

Suddenly, this morning, my 1TB white light was virtually at the top, when I checked it said I only had 198GB left.

However adding up the separte folder info (I’m on a Mac), I can only get it to around 460GB. What has happened?

Hello freind to better assit you is it possible you post a screen shot of the issue?