Of course you know that a quarterly is a Cashflow report and not...

Of course you know that a quarterly is a Cashflow report and not a P&L. I.e Cash receipts are not necessarily the revenue earned in the period, and could be the cash collected related to sales that may have occurred in another period. And the production costs may have been incurred in a prior period, but only settled in this period. You need to be careful with the analysis of netback, based on a statement of cashflows.