Dear Millan ,
Stock 76 is showing in the screen shot against to the sales order is not a value and it is QTY , which is reserved against sales order
In MMBE you can see the stock QTY only , if you want to see the value of particular sales order you can see in VBAK table net value field .if you want to see further details you can see in Tcode MD04.
Regards,
C.B Reddy.