Then what would the exceptions be? This argument is only additional support for my motion to vacate and is not at all the most significant irregularity in the matter.

The court that issues the order has exclusive continuing jurisdiction, but it can cede jurisdiction to another court if it is no longer an appropriate venue - I have only ever seen this when none of the parties live in the jurisdiction anymore, and evidence about the best interests of the child (usually in the form of witnesses) is more readily found elsewhere.

Thank you for your feedback.