Can't change the rating of an app on apps.homey.com

I don’t seem to be able to change the rating of an app on apps.homey.com (after a new release works better / worse).

Correct, you should rate the apps on https://apps.athom.com
but, no kidding: It works for me,
Ik guess you should have the app installed and be logged in to your Athom account.
but for me it works. (Tested Review without feedback text)