[Samba] User & group sid the same ??

[Collen]

G'day.. just a problem that suckes here..

i just migrated from a NT4 domain.
and i net vampired my users, worked gread.

but now i have a few domain group with the same SID as a User ??
how is this possible..

i removed the group_mappings.tdb file and re-mapped the group's again.
hoping to get new fresh SID's for them.. put nope..

how can i fix it.. (can i reassing new sid's to the users)

and what if i make new users in the future, do they take the same sid's as 
from my existing group's ??
kind of strange that samba map's users sid's to group's sid that already 
there (and vice versa..)

How can i fix this ??, or is it just a small bug ?
L8r
Collen