Need help understanding the Aggregate Inventory Transactions per Period & the Inventory Value per Period report.

We are in Apps 10 Update 15, using Standard Costs for GL.  When running the process, Aggregate Inventory Transactions per Period & the Inventory Value per Period report, we have some products on the report with the Period End Unit Cost different than Cost Set 1 (Inventory value).  I would think this value would match.

To investigate further, I zeroed out the inventory value of Cost Set 1 and reran the Aggregate Inventory Transactions per Period. I’m assuming that when I run the Inventory Value per Period report, the part should have a unit cost of zero, this is not the case, it’s off by 0.14. 

How do we fix this issue.