Security Groups Not Propigating Down To Client

I have created a few Security Groups and added users to the groups to map drives at logon. On almost all the machines the users show up in the groups and the drives map. However on a few machines the drive mappings based on the groups will not map.

If I run a “IFMEMBER” on the local PC thier not shown as in that drive mapping group. The same happens if I run GPRESULT. The machine shows as pulling the latest GP down from the server.

To confuse the situation even more if the user logs onto another machines it shows them as in the groups and the drives map!

Both boxes the user is signing into is XP.

Ideas?