It is the default behavior for the map control. When you change a zoom level using the mouse wheel, then the zooming is performed according to the current position of the mouse pointer (zoom to point).
You can disable this functionality to keep the center of map on your MapPinPoint. Also you can specify the MouseClickMode, MouseDoubleClickMode, MouseDragMode and NavigationVisibility properties to avoid changing the center of map.
All the best,
the Telerik team
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