This is what I use:
Dropbox Used Disk Space:
Size: 79,1 MB (82.960.660 bytes)
Size on disk: 86,9 MB (91.201.536 bytes)
Contains: 3.499 Files, 16 Folders
This is what Dropbox says:
Using 7.59 GB of 5.5 GB storage
It suggest I either make room by deleting files or increase my paid subscription.
How is it possible with only using less then 90 MB?