If you click on a train listed in the left menue, the "animateTo" function is called:
With every click the zoom level increases and the graphic, that should be in the center moves to the top of the window when the zoom level increases. With a very high zoom level the graphic is outside the extent of the SceneView. The movement of the graphic can only be observed, when the camera is sloped. If the view is orthogonally from the top the graphic is always in the center.
I am really sorry, but i cannot publish the demo here, because of the train data, but i hope the problem can be retraced.