Folder sizes: Empty vs 0 Bytes?

DOpus 12.12.1 Beta Windows 10 x64.
Below is a lister with only folders. There are NO files within any of the folders. Why do some show "empty" and some "0 bytes"? Not sure if this was the case for previous versions. Not a big deal just wondered why.

Bob Gregory

"Empty" means literally nothing in them at all, "0 bytes" mean they have one or more files or subfolders in them but that those files or subfolders are empty.

Thank you Jon. Makes sense and yes those that show '0 bytes' do have sub-folders with no files in them.

Thank you