Screenshots? At first glance, it looks like you're somehow seeing the
xattr metadata that is attached to each media file.
What File Manager are you using to view file listings on the client-side?
What SMB configuration are you using on the server-side?
xattr metadata can technically be seen as "file"
(i.e. arbitrary data) internally on the file system level, but it's not typically displayed as such by file managers because it's not a "file" as end-users would typically understand the concept.