You have hit an issue in the RadMap MapShapeBindableWrapper's code which updates their Geometry.
We logged it in our feeedback portal
. The initial show is also postponed because of code which subscribes for width / height change notification. We will address this issue as well when working on the core one.
As a workaround we could suggest either using Visibility for hiding the circle with no width / height or changing the BindableWrapper object in the template with FrameworkElements (in this case Ellipse).
Telerik by Progress
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