Learn business growth with Google Analytics 4 › Forums › Google Analytics 4 › The Discrepancy Between Google Analytics 4 API and User Interface Data › Reply To: The Discrepancy Between Google Analytics 4 API and User Interface Data
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You might be experiencing a data sampling issue. When you add more dimensions to your API query, Google Analytics sometimes uses a smaller subset of data to give you the result (especially when dealing with vast amounts of data). That might make the result a bit different from the full picture you get when you pull just the session numbers. Worth looking into!