G-Drive/APFS format automatically resizing folders?!

When downloading RED Komodo video footage from a CFast card to our G-Drive 10tb (formatted with APFS) I’m noticing every folder is a different file size than what is on the CFast card. Does anyone know why this is? Does APFS automatically compress/resize folders and all the data is still fully there, or would this be a G-Drive malfunction?

I have a WD 18TB USB 3 drive as our Master Backup, same formatting with APFS, and it doesn’t show a different folder/file size.

I’m baffled. PLEASE HELP.