file size change

It can change if you are trying to copy on the flash drive a folder which uses more disk space than the flash drive can have. A message that the drive you're trying to copy is full appears and you can either retry or cancel. Clicking cancel means that will be files which didn't copied on the memory and that is why the size changes.
 
On your computer the system files is ntfs
on your Key it's fat32
on fat32 their is no control on the security (can't ad user or group in security)
When you copy file or directory in the key, the folder lost the control of shared and security

I think it's that.
 
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