Upload mismatch from Windows Software Distribution Wizard

As a master operator, I’m able to successfully use the Windows Software Distribution Wizard to capture a folder and have the payload added to a fixlet as a prefetch command. When a non-master operator does the same steps against the same source from the same BigFix Console server, the output sha1 is the same but the file size is slightly less. The result is the BES Client fails to successfully download the payload when the fixlet runs.

Has anyone every seen this before or can explain how the sha1/sha256 could be the same but the file size be different, and what I can do to allow this non-MO to successfully upload payload to a fixlet?