When you edit this page: does it say that it it is actually a normal page ? (It should say 'Edit Page' at the top of the page.
My guess is that it is actually empty, but the view 'shows something'.
For example, it could be a collections that list content, or just a 'placeholder' for diazo.
Does
http://path/to/my/page/getLayout return 'document_view' ?