My app defines the intent filters to handle URL\'s from my site defined by
System app selection window in two cases
1) User makes changes to settings related opening links by going to settings > apps > gear icon > opening links > select an app > open supported links > choose prompt every time.
2)Default app is not set by user and auto verify is not enabled in one of the app links supported app
I think in your case auto verify is enabled, so please check user settings.