I have tried each of the following settings of permalink /%post-id%/%postname%/ and /%postname%/ (alone). I am getting in each case the whole list of pages: http://mydomain.com/parent-page/child-page-1/child-page-2.
I had used permalinks before and did have this situation, i.e. I got only the name of the page itself.
Any suggestion how to resolve this?