I recently noticed a bug with the widget of notifications. If you show a centered notification and when is fading you show another one, the second one isn't centered but on the bottom right corner.
You can check this behaviour on the next link:
Click "show centered notification" and when the notification starts to fade away, click again.
I started to notice this behaviour when I updated my kendo version recently. Now i'm using kendo version 2016.1.226.