It is common practice with the TTB report to NOT report gains and losses on the same report. You should make these adjustments manually when submitting the reports and offset the numbers enough that one zeroes out. For example, 2 pf/gal of gains and 7 pf/gal of losses should become 0 pf/gal of gains and 5 pf/gal of losses.
When submitting your reports, the total columns should be manually adjusted accordingly. If you have questions or observe different behavior within your reports, contact the FIVE x 5 Support team at firstname.lastname@example.org.