After mounting a CIFS filesystem to /mnt/backup , when I try to create a folder on the system, such as 'test' - I can not only see /mnt/backup/test, but there is also ANOTHER 'test' under the first (/mnt/backup/test/test)

When trying to delete these directories from the client. I get:
"rm: cannot remove directory 'test//test': No such file or directory"

These folders can only be deleted from the windows box