In this case, Google presents the phenomenon of having the same URL ranking at the bottom of the first page and the top of the second page. This can happen when Google directs the DNS (Domain Name System) entry to a datacenter IP during browsing, where the data differs somewhat. This affect does not occur very often and is probably caused by issues at Google (the server that handles our current session ID crashes, load-balancing issues, etc.). The same phenomenon can occur during manual Google searches in a browser. This is not a bug.