I just tried this, and can confirm the bug by following these steps:
1. Run 'users-admin'
2. Add user "foo01"
3. Add user "foo02"
4. Run 'nautilus /home' to confirm users have been created
5. Exit 'users-admin'
6. Reopen 'users-admin' - "foo01" is not there, "foo02" is.
I just tried this, and can confirm the bug by following these steps:
1. Run 'users-admin'
2. Add user "foo01"
3. Add user "foo02"
4. Run 'nautilus /home' to confirm users have been created
5. Exit 'users-admin'
6. Reopen 'users-admin' - "foo01" is not there, "foo02" is.