I extract the report which is items sale and remaining quantity for each vendors for shopping mall retail sales. No error showing and jet formula I wrote is correct. When I run the report, the result is not showing true quantity. So I re-run or I make drill-down, the result which I cursor changes to true quantity without rewrite any jet formula. This is happening for some items not all items. How can I solve it?

Thanks;

This is the formula I wrote.
First time running result but not correct
Second time running result for same row and result is correct for that row I cursor.