Somehow, edit/delete has been changed to node->title/edit or node->title/delete for one of my project. Can anyone have idea what could be a reason? Somehow, edit/delete has been changed to node->title/edit or node->title/delete for one of my project. Can anyone have idea what could be a reason?

Any lead towards the debugging would be appreciated.
On one of my projects, for this kind of functionality I have used Sub-path URL Alises module. Maybe it's enabled on your project ?