I noticed this strange behavior in the page hierarchy yesterday.  i moved the page around and still it would not show correctly.  i followed this post and the hint to look in the database...indeed.  the pages with the problem have a 0 where a 1 or 2 should be.  i changed these values, restarted the dnn application and the pages now show correctly.  

initial install version: 5.1
current version: 05.04.01 (26)

I'll try the upgrade to the latest release and see if the problem shows up.

I'm still having MAJOR hierarchy issues and I've upgraded to 5.4.4 What's happening now is if I change a page's parent page to something else all of its sub pages disappear. They aren't in admin > page menu, they aren't in recycling bin, you can't follow any links to the URLs (even if you adjust path in URL to the new parent page). If you go back and change the page back to it's original parent page the sub pages reappear. Also, on the admin > page menu pages aren't appearing with their actual hierarchy. Some pages appear on the list to be the child of pages they are actually siblings of. (if you go to the page both the bread crumb and the page page settings make it appear to be properly set up. I would worry less about the admin > page menu looking wrong, but the way the pages are appearing in the drop down menu is how they are set up in the admin > pages menu, not how they are set up on their page settings. I'm wondering if there is some way I can report this better? Every related issue I find in Gemini is marked resolved. My site is definitely not resolved, and I could lose weeks of work on content as a result.