Hello Gwen,
This behavior is normal and expected. Calling the show method to a tile layer not only shows it, but points the extent of the map based on the first image in the layer's grid.
To prevent that from happening, you can reset the map's center by using the center method. Here you are a dojo with the solution: http://dojo.telerik.com/AVAHI.
Regards,
Ianko
Telerik by Progress
Build rich, delightful, *native* Angular 2 apps with
Kendo UI for Angular 2.
Try it out today! Kendo UI for Angular 2 (currently in beta) is a jQuery-free toolset, written in TypeScript, designed from the ground up to offer true, native Angular 2 components.