Can't copy file even with Admin permissions

I have file: /c/Config.Msi/3da9e136.rbf that I cannot copy, even when
I run bash as an administrator -- seemingly due to perm/acl errors.

Specifically:
        # mv 3da9e136.rbf newfile: works
        # cp 3da9e136.rbf newfile: works

But,
        # cp -a 3da9e136.rbf newfile
        cp: preserving permissions for ‘newfile’: Permission denied
        (though the file is created)

If I then do
        # getfacl 3da9e136.rbf | setfacl -f - newfile
        setfacl: more than one user entry.

And:
        # getfacl 3da9e136.rbf
        # file: 3da9e136.rbf
        # owner: Administrators
        # group: SYSTEM
        user::rwx
        group::rwx
        other::r-x
        user::rwx
        group::rwx
        group:SYSTEM:rwx
        mask::rwx
        other::r-x

While:
        # getfacl newfile
        # file: newfile
        # owner: Administrators
        # group: SYSTEM
        user::rwx
        group::rwx
        other::r-x


So the problem seems to be that the 'user' (and presumably also the
'group' and 'other') ACLs are duplicated.

- Is this a bug? (or a feature?)
- Any idea how or why this happened?
- Any idea how (or whether) to fix?

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