My opponents QB had -12 yards rushing but received zero points. Why didn he receive a negative point?
True, Drew Brees had -12 yards rushing and your league is configured to grant one point for every positive 10 yards gained. It may make sense that a negative point is assigned in this case, but your league must be configured to allow for a negative range. That means that in the Rushing setup in the Scoring Matrix a range must be set up to assign a negative point for -1 to -999 rushing yards.