Hi,
We are not able to reproduce the reported issue on Dynamically Node Creation after Save, Load process. We have created a sample based on the reported issue, please refer the sample form the attachment.
In this sample, three buttons placed at top center position which are used for to create a Node dynamically, Save and Load. It will be of great help if you send us more details like a simple sample that represents the issue.
Regards,
Maria Amal Raj T,
Diagram WPF & Silverlight Team,
[Syncfusion].
AddingNewNodeDynamically_fce23d02.zip