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The reason why you’re only seeing 2.7K sessions when you choose the source or source/medium dimension could be due to the specific segment or filter you’ve applied to the view. If you’ve added a segment that only includes certain traffic sources or mediums, the total session count will drastically decrease from what you’d see without any dimensions. Also, it could be that your data isn’t well-tagged and Google Analytics can’t identify traffic sources for most of your sessions, which might lead to fewer sessions being attributed to recognized sources. Another possibility is that there may be some data sampling going on depending on the size of your dataset and the complexity of your queries. Google Analytics will sometimes sample your data to provide quicker query responses, which may not represent the total number of sessions accurately. If none of these are the case, it might be worth directly reaching out to Google Analytics support to clarify.
