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The issue is ranking fluctuations, there are certain factor that affect your SERP rankings,
- Personalized search (you are logged into your Google account)
- Your geographic location
- Busy data centers
- Browser settings
For the Searching - you can make sure you always check the same way...
* Logged out of G Accounts
* Opted out of Personal Search
* Use the same computer
* Use the same browser
* Use the same Search page
* Use the same Search settings
That should help reduce the likelyhood of "bias" interfering.
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