Mismatch in session counts
Re: Mismatch in session counts
That data is not always for all visitors to your site:
From the help docs:
Demographics and interests data may only be available for a subset of your users, and may not represent the overall composition of your traffic: Analytics cannot collect the demographics and interests information if the DoubleClick cookie or the Device Advertising ID is not present, or if no activity profile is included.
The graphs and the first row of the Sessions column in the Overview report display the percentage of your overall data that is represented (for example, Age - 41.39% of total sessions).
Neither analytics.js nor ga.js collects demographics and interests data.
More info about where this data comes from etc. can be found here:
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