samba - Oct 2002 - Added NT$ machine to SAMBA PDC and got this in the administrators group?

weird, just created a new machine account via useradd(mandrake 8.2)  and
then logged the NT4 machine into the samba domain, by default "root"
or
"admin" was not added to the administrators group, so i logged into
the
local machine and added them manually. Spotted this though
under members:

NTGX\unix_group.2147483404??


what's this all about and why did "root" not get added to the
administrators group automatically?

cheers
rod