No Dave, i'm able to delete the pkg and the subsite as well.
On each subsite i installed only "edit-this-page pkg". But i believe the problems are on the references of that, which i don't know where they are located.
Because I "unmounted" and "deleted" edit-this-page on each subsite and after i "delete" the subsite. Then i create a new subsite with the same name and url, and install the edit-this-page aplication with the same name.
I did that because i created a structure of subsites but then i realised that i missed one level. then i had to re-built again. So, i just did the same process with the same names, in order to get rid of the problem, but then the bug show up.
however i'm concerned the pkg-keys are unique for each instance, even if you uninstall and install another with the same names, the new one will receive a different pkg-key.
So it means the references haven't been deleted of the system.