android Screen size messed up on Android device - debug APK - Android Studio

I’ve been testing my game on my Android device by packing my .apk in Android Studio by going to the Gradle view, selecting my Android Module and pressing build.
The Android/build/outputs directory now gives my 3 apk files that i upload to my device and install.

A couple of days ago “everything” was working fine, but now all of a sudden the screensize is messed up.
I have set screensize to 800x480 which used to work fine, but now it seems as if my android device tries to scale everything up by a factor 2 (now a quarter of my usual window is filling up the whole screen).

I’ve got no idea why this is.

Anyone experience with this?