[Samba] weird output from id

[Andrew Tranquada]

We are using winbind for windows SID to unix UID conversion.
When I do
id
I get:
uid=373294482(andrew.tranquada) gid=373293569(domain_users)
groups=373293568(domain_admins),373293569(domain_users),373293628(denied_rodc_password_replication_group),373294172(dcterminal_user),373294207(sql.admins),373294210(scom.administrators),373294701(datacenter),373294719(<redacted>),373295722(<redacted>),1102714036
context=user_u:system_r:unconfined_t
[andrew.tranquada at login1b.dc ~]$ tail /var/log/samba/log.winbindd

I would like to draw the attention to the number at the end.
log.winbind says:
could not convert gid 1102714036 to sid

HOWEVER
if I do id andrew.tranquada
I do NOT get that number at the end, and log.winbind does not log the error.

id andrew.tranquada
uid=373294482(andrew.tranquada) gid=373293569(domain_users)
groups=373293569(domain_users),373293628(denied_rodc_password_replication_group),373295722(sophosadministrator),373294719(<redacted>),373294172(dcterminal_user),373294701(datacenter),373293568(domain_admins),373294207(sql.admins),373294210(<redacted>)
context=user_u:system_r:unconfined_t

This has happened with samba 3.4.x and 3.5.x (currently we are on 3.5.2)
Can anyone explain why this is? What is id doing differently?

Any insight at all would be VERY helpful. Thanks!

-- 
Andrew Tranquada