Do you use more than one location? Quantity on Hand includes items in all locations.
What costing method do you use?
If you use a FIFO costing method, and do manual or imported adjustments, you might find that while total quantities are correct, some lots have negatives offset by positives in other sets.
Try looking at "quantities" in other ways.
_________________________
Kate Spontak
Stief Group
New Jersey, the Garden State