XP SP3 not in update list

Hello,
Running WSUS on SBS 2003. When reviewing the list of all approval types
and all update types, I still don't see XP SP3 in the list. I have Service
Packs selected as synchronized updates. What's more, when I review the
computer status for the 3 machines in my updates test group, they are all
showing in WSUS that SP3 is the current service pack. However, when I go the
physical machine's general system information, one PC shows SP3 and the other
2 show SP2. Can someone please point me in the right direction? Thanks!
Tyler