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Created attachment 16938 [details]
Example project with picture showing Debug output of DataTemplates initialized
In the example project there are in MainPage with two DataTemplates defined.
Those templates are initialized on application run even the templates are not used.
root DataTemplate is CustomGrid that has in constructor/destructor Debug.WriteLine to show how many instances of those Grid control exists.
You can see marked those lines in TemplateInstanceInitialized.png
Hi seems you are using DataTemplateSelector from Xamarin.Forms.Labs project.
This doesn't seem a issue using normal Xamarin.Forms version.
Please reopen if you can reproduce this using only Xamarin.Forms code.
Xamarin Forms team