I have configured my custom domain and can see the green tick on railway but then that domain redirects to default railway public domain. Why is this the case?

I also deleted the default public domain xxxxxx.up.railway.app but my custom domain still is redirected to this domain. Where is this cached or why it is redirecting?

https://dev.chordmuse.app goes to https://chordmuse-sandbox.up.railway.app/admin

Also, it is more than 24hours so DNS propagation should be all good.