Which namespace should I use when push a docker to GitHub?

I pushed some docker images to GitHub and found something interesting.

  1. I pushed 4 docker images, but the number next to Packages is 2 not 4.

  2. The icons displayed before the project name are different.

I checked and found

The reason for these two problems is that I have pushed the docker images to different namespace, the above two are pushed to https://ghcr.io, and the below two projects I have pushed to docker.pkg.github.com.

Why I changed the namespace? I am referring to this document, namespace has been replaced.