F.12 Report

We have 6 purchase orders. MIRO is completed for all the 6 purchase orders and 4 purchase orders have non-deductible tax code and 2 purchase orders have deductible tax code.

When F.12 is executed the report is showing correct amounts for all the 6 purchase orders but is showing different purchase order number and different material code in respect of only one last purchase order.

What could be the reason for this system behaviour?