Please note that when the status of an Order is updated to Paid the statistics are updated and the order appear in the statistics with the date when the order has been placed (not the date when the order is marked with status Paid).
For example, if you have an order which is placed on February 3 and it is with status Pending, this order will not be included in the order statistics. However if you later mark the order as Paid for example on February 9, this order will appear in the statistics for February 3, when in fact the order has been placed.
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