InputTouch location values wrong screen size

I observe a strange effect: Debug printing shows, that InputTouch event reports a location for a screen resolution of 1280x720. The mobile device definitely runs on 1920x1080, I verified this with some UMG widgets.

Shouldn’t the location values match the actual screen size? Doing same on Windows (Use Mouse for Touch) works correctly.

I’m not able to find any cause for this. Some ideas out there?