Hello, I recently had trouble changing page order and checked the support window but found the replies to be long and hard to parse through. I was able to resolve my issue so I thought I would share my approach.
Normally to set the page order, you go to pages, you click on your page, and you select the order in Page Attributes (on the right side). However, if you have custom menus, you will also need to reorder your pages to be in the correct order. You can get to your menus by going to the Appearance tab in Dashboard and then make sure you select the menu that is currently enabled and save after dragging the pages to the correct order.