That behaviour is caused by you seeing data from different DCs when you search. There is no longer any such thing as "the Google index", rather there are several different flavours, covering different data sets, and ranking parameters.
Rankings per se are more and more becoming worthless as an absolute measure of SEO performance, since doing a like for like comparison is becoming harder and harder (and I haven't even mentioned Universal yet) - don't focus on rankings, look at traffic. It was always good advice, but it's becoming the only good option now
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