Ionic Template shows up after i reopen my app. Only production

My app has been tested and never fails in development.
However when I released it to app store and download it and start the app I get problems. The app shows up, I use it. However when I quit it entirely and start it again I get the ionic template page “The world is tour oyster… read the docs…”. And I can’t lose the screen but have to reinstall the app.
It is so weird and annoying. I can’t find anyway that my app references to that page. The only place the page even exists is in node_modules/@ionic/app-scripts/dist/deep-linking/util.spec.js
Anybody has an idea what the problem might be?
Yours Haris.