Great question — answering as the UphillTech team:
If you are only presenting the non-www urls, then you probably have a redirection somewhere that redirects www urls to non-www urls. GSC just presents it to you as redirections. This is normal. The ordering / ranking of the pages changes not just because of what you may have done to your pages, but also because someone else may have done to their pages. The best way to see how Google is presenting your pages is to open Google search and use site:mydomain_name
Full answer by Rohit Gupta: https://webmasters.stackexchange.com/a/142870 (CC BY-SA 4.0).
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