On Friday (November 11, 2016), my Confluence Cloud space's the page tree worked as expected. Today (November 14, 2016) the page tree is showing pages that it shouldn't at the root depth.
For example, the page 'The World Component' is three levels deep. Here it incorrectly shows in the sidebar at the root level:
depth-pagetree.png
On 'The World Component' page itself, you can see its depth in the breadcrumb:
depth-page-breadcrumb.png
You can also see the depth of 'The World Component' page from the Reorder Pages page:
depth-reorder.png
Is this a bug? Or is there a setting I'm unaware of, that someone else might have changed?