Hi there, Kudzani. The Summary and Detail reports should display the same quantity for each item. The only difference is that the Stock Valuation Summary shows the totals, while the Stock Valuation Detail provides a transaction-by-transaction breakdown.
To ensure that both reports reflect the same data source, set the date range to All Dates and click Run Report. After that, if the QTY columns do not match between the two reports, check if the item has gone negative or if there are unusual transactions, such as deleted bills or inventory adjustments.
If you have any additional questions regarding QuickBooks, please feel free to leave a comment below.