I recently spoke with a faculty member who was adjusting the grades of one of his student's submissions. The student attempted the quiz twice, so there were two submissions. The faculty member used the SpeedGrader to add points on three problems in attempt 1 (1 point each, for a total of 3 points). When he finished, the fudge points for the second (and final) attempt showed -5 points.
This looks like a bug in the SpeedGrader. Is this a known issue?