Persistence Size - LL3 on 8G USB drive

[Ironfighter]

I have installed Dropbox, Spotify, Kodi, LibreCad, the restricted codecs, and the Web Cam application. I used the Lite Tweak accessory to establish how the memory on a 32G stick with 4G persistent memory.  I must admit I am surprised that It's indicating that I still have 25G of memory available - can this be correct??