Google Analytics shows both Netlify subdomain and actual subdomain

I have a few subdomains under felixparadis.com and Google Analytics setup for most of them.

Let’s take timeline.felixparadis.com as an example.

When I look at the analytics, sometimes I see
timeline.felixparadis.com
and sometimes I see
master--nicetimeline.netlify.app/

Any idea why Google sees different URLs for the same page?
(This happens for other subdomains and the main domain as well.)

Hi, @FelDev, the https://master--nicetimeline.netlify.app/ version of the site includes and runs the Google Analytics javascript. This is why it is being reported there.