Hi Craig
A bit more background on where I was going with the question, which may help you with troubleshooting the problem. When you create your replica between the default sde server and the regional server, you connected to a specific version on the regional server to do so. This would most probably be the Default version. This version is referred to as the Replica Version. Now on the regional server you create checkouts for editing purposes, correct? If these checkouts are created from a version other than the Replica Version (e.g. Child1_version created from the Replica Version), then after your check-ins, you would need to reconcile and post Child1_version with the Replica Version before syncing back the replica to the default sde server.
Hope this helps.
Regards
Cheryl