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The unique visitors metric does not add up to individual line items when line items are dates(trended). Each line item (such as day, week, or month) receives credit for every period the visit/visitor touched, but the total is deduplicated.
Pls refer foll article.
https://helpx.adobe.com/analytics/kb/sum-line-items-different-from-total.html
https://marketing.adobe.com/resources/help/en_US/reference/reports_unique_visitors_v15_dsc.html