ContentPage cached im memory?

Hi,

I got a Xamarin Project with currently only Windows Phone.
I got a ContentPage that calls another ContentPage via Navigation.PushModalAsync(new ResultPage(result));
The ResultPage loads some Data from the Internet and displays them.
When I go back and open the ResultPage again, somethings seems to be cached or so, because the loading screen isn't shown.

I got the newest Xamarin Version and my WinPhone Project is targeting Silverlight 8.1.

P.S: Also strange: The Navigation.NavigationStack.Count is always 1.