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This is likely due to differences in how Google Analytics 4 calculates and segments data based on the presence of certain dimensions. When you add a new dimension like ‘date’ to your data, GA4 disaggregates the data into more detailed segments. Each data point now corresponds to a unique combination of ‘session default channel’ and ‘date’. Thus, if a user accessed your site through different channels on different days, they would be counted separately in each respective category upon adding the ‘date’ dimension. This disaggregation can sometimes result in fewer users for certain channels or dates, especially if some users access your site infrequently or through multiple channels. This is an expected behavior due to the way in which GA4 handles multi-dimensional data, rather than an error or bug.
