Everything is 4.1kb when it isn't.
I've never used the folder size in info (File manager).. it's not correct of course.. ie it's not totalling the size of all sub folders and files. I suggest you do this via ssh yourself if you want an accurate picture.
That's the size of the folder on disk, not the files within it. It's similar to what you would see if you ran ls -l in the parent directory.
ls -l
