Problem with permissions

Hello:
I defined a group named adm_sepi . I have a lot of pages and a content type named sepi. In this content type adm_sepi have permissions to edit, delete, view, and all of things :).

When i create a sepi content there's no problem for editing with adm_sepi role, but when i change a page content to sepi content with nodetype i couldn't edit the page with adm_sepi role. I don't know if there is a problem or i forgot something.

Thanks in advanced