Hi Joshua,
Base on your description, I think you are using "Portfolio Item Cumulative Flow" app. You could click the gear button to check the setting page for your "The Story Cumulative Flow Diagram". Then add the same app from your DashBoard, just copy the same setting to your new "Portfolio Item Cumulative Flow" app. Then you should able to see it in your Dashboard.
The article below outlines how to add the app to your Dashboard
To access the article directly: Customize Your Dashboard | CA Agile Central Help
Since we don't have access to your subscription. So please let us know if you are not using the "Portfolio Item Cumulative Flow" app. And your "The Story Cumulative Flow Diagram" detail info with us, so that we could identify the app you are using.
Regards,
ZhaoKun, Du
CA Agile Central Customer Support