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Group Header Template Doesn't Update

I'm using a group header template along with a converter to display the average of numbers in the group. If one of the items in the group gets updated, the the group header doesn't get updated until I scroll it off the screen and then back.

In hopes of not having to come up with a complete sample, I have attached a video that demonstrates the issue. When the data initially loads, the average correctly displays as 122/80. If I edit the systolic number of one of the items and close the edit screen, the average doesn't get updated. If I scroll far down in the list and then back to the top, you can see the average is updated to correctly show 123/80.

I am using mvvm and binding to the ItemsSource property.