I'm having my permissions change on the Samba share automatically?

Created a share folder call Company_Share
ran chown -R root:users Company_Share

Confirmed permissions on file: drwxrwx--- root user Company_Share

Samba smb.conf
[Company_Share]
comment = Company Share File
path = /share/Company_Share
valid users = @users
write list = @users
force user = root
force group = users
read only = No
create mask = 0770
directory mask = 0770

The next day the permissions changed to: drwxrwxrwx root admin
and all the files in the directory are drwxrwxrwx root admin

Check cron jobs and nothing out of the ordinary?

Server: Ubuntu Linux 8.04.1
Samba version 3.028