App starts with Ionic Menu Starter, every second time i start it

This is a weird problem…

I have been working on an app for a while now. Ionic 3.9.2.

I build it for iOS and run it on my phone from xcode for the first time, it works as it should.
Then the next time i start it (without deleting it from my phone) the app starts with the “Ionic Menu Starter”.
I have no idea where this comes from. I have searched my Webstorm project for “Ionic Menu Starter”, but i can’t find anything.

Are there anyone else who has seen this strange behavior, and maybe have a way to fix it?