Page Not In Menu Appears In Menu After Edits

[mvlcek]

Say, for instance, I'm editing the "Privacy Policy" page. Once I make my changes and save them, that page will appear in the menu on the website. I then have to come back to this page and fix it. Here, the "Privacy Policy" page would not be indented anymore - it'll be black (not gray) and all the way to left. Once I indent it, it won't appear on the menu anymore...until I edit the page again.

The I18N plugin does not allow you to specify a private page as parent, as this might create problems like exposing the URL of this private page (if you use fancy URLs %parent%/%slug%).
However, the navigation structure view allows it (which is a bug).

If you edit one of the child pages and show the options you will see that the page has no parent, as the private page does not exist in the dropdown. If you save the page, the parent is thus reset to none.

Make the parent page (Calendar) not private and everything should work.