I've had this same problem and here's what I found - that static electricity occasionally causes bits of powder or even airborne dust to stick to the little cup that holds the powder. When I find what looks like an overcharge, I wipe the cup with a clean, soft cotton rag and then weigh it again. Nine times out of 10, it was the dust. Occasionally the powder measure will throw a slightly larger or smaller charge, but well within safety limits.
I also built, using wood dowels, a small "fence" around my scale on the workbench so it's always in the same place.
Regards,
Ken Strayhorn
Hillsborough NC
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