Remove Pages says:
It is easy to accidentally create local pages with the same name as desired remote pages. These pages are not easy to circumvent.
You can bypass an unwanted local page by directing your browser to the remote server. When you start browsing at a remote page then other pages on that site will be preferentially retrieved.
This seems like an unfortunate side effect of the unique page name convention. That convention works well in centralized wiki, not so much when federated.