Scrap Reports - scrap cost not at standard Cost


Pretty new to NAV and find it rally difficult to find the reasonng behind this. If I run a scrap report I can see what production has run and the amount they have marked as scrap on each RLP.

The finished goods transaction have debited stock with the correct standard which includes direct material, direct labour and overhead cost, although when I run the report the material cost per unit, labour cost per unit, overhead cost per unit are not on standard on the report, please can someone let me know where the report is getting these very strange figures from?