Hi DanSChubel,
Thank you for using Syncfusion products.
I am afraid, that I was unable to reproduce this issue. Could you please have a look on the below online sample and if the issue still exists, try to reproduce in a simple sample and send us the modified sample so that we could sort out the cause of the issue and provide you a solution.
Sample link:
http://samples.syncfusion.com/ASPNET/8.2.0.18/Web/Chart.Web/samples/3.5/Data%20Binding/CustomCollections/CS/CustomCollections.aspx?args=9Let me know if you have any concerns.
Regards,
Jaffer.B