I'd say you'll probably just have to write off this one. But you might want to think about setting up new procedures for scale operations so there is no confusion over when to adjust positioning on the scales and when to drive off. I've used five different local yards, each with slightly different procedures but with one common feature. I would never be waved off or given a green light until the load was weighed/recorded. I'd get yelled at to "pull up a little" but not waved forward.