Work Order WIP discrepancy issue

Hi All,

Came across an issue in Work Order I was hoping someone might be able to shed some light on -  for a given work order, we are simply issuing the necessary raw materials out of inventory for the work order, then completing the finished goods, however the cost of the finished good comes out to less than the material we pulled out (leaving a balance in the WIP account).  Both raw materials and finished good are FIFO valuation.  Any advice on what we might do to investigate/troubleshoot this?  Let me know if I can provide any additional information.  Thanks!