Forecast and MRP

Ok, we have work orders, sales orders and forecast all going into MRP.  For sales orders and work orders I see the inventory as UOM Each.  However, I think that the forecast is coming in UOM 72 or 30 (our flat size ).  As you can see below the forecast only is consumed by the quantity of flats not the default quantity of each.  Sales order 5424 for 30 reduced forecast demand 26-2015 by one piece and sales order 3822 for 60 reduce forecast 27-2015 by 2 pieces.  This really messes with planning work orders and other areas.  Why does this uom change occur?  All other items are each but not forecast.  Any ideas out there?