I'm not able to reproduce this behavior. I only get this behavior if I visit node/add/page and then re-open node/add/page from the admin menu (effectively opening the page twice in a row). I think this is the expected behavior in this case, since the previous page was node/add/page
Wow, that sounds awful...
So maybe it's not even related to other modules, but some... cache problem somewhere? Be it browser or server-side? A Heisenbug.
Comments
I'm not able to reproduce this behavior. I only get this behavior if I visit node/add/page and then re-open node/add/page from the admin menu (effectively opening the page twice in a row). I think this is the expected behavior in this case, since the previous page was node/add/page