Sales report for VPP Sales - Customer Price

Hi,


I've been going through somes sales reports for some of our apps which are available for purchase in the Education VPP store. It is priced at £9.99 or £4.99 with the 20+ copies discount. However, for some sales, the Customer Price is £8.33. Does anybody have any ideas why this would be? I would always expect the Customer Price field to contain the value £9.99 or £4.99.


Thanks.