these nodes were generated (duplicated) using code. I quickly and messily adapted some code i saw in another post. I'm on sitefinity 4.0 sp1.
var mgr = App.WorkWith().Page(pn.Id);
p.ShowInNavigation = true;
p.Parent = parentPage;
p.Page.Template = myTemplate;
Also I've cycled through the PageNode.Permissions list and see that all properties are identical to the properties of the PageNode I've duplicated.