Check Item Card: Cost is Adjusted should be checked…
If it is not checked you should have Purchased Receipt that has not been invoiced or Sales Shipment that has not been invoiced or Sales return tat was received but not Credited…
If you user Production you can have Production Order output with non finished Production Order… or one of the components or subcontracting purchase orders was received but not invoiced.
In the Item card, there is a tab named ‘Invoicing’ , and there is a boolean field named "Cost is Adjusted’. May be this field is hide , so you can find it by using the “Zoom”.