NIS problem

Hi,

We have here a bunch of computers (RHEL 4) working under NIS and
shadow. We wanted to add one group more to the users, but it looks it
is not getting that new information in the database:

id agr
id=1068(agr) gid=1007(agr) groups=1007(agr),100(users)
make group
Updating group.byname...
Updating group.bygid...
ypcat group | grep agr
agr:x:1007:

What am I doing wrong? What am I missing?

Thanks in advance,
Á.