Can't delete some users

Running GW Data Sync 1.2.5.250. We use an LDAP group to add/remove users in our Data Sync server. I removed 15 users from the group and around 6 of the users were deleted from Data Sync, but there are still 9 users that are no longer in the group that are still on the Data Sync server. I have tried adding the users back to the group and removed them from the group but their accounts still remain in Data Sync. I tried manually deleting the user in Data Sync, get confirmation to delete the user, and the user is still on the list of users in Data Sync. I have also used an LDAP browser and checked the members of the group to make sure the users I have deleted from the group in eDir are no longer in the group. Has anyone else experienced this problem? Any suggestions on how to fix?

Thanks,
RSarno