@SBMI
It sounds like you might be manually increasing your inventory quantities and then posting the payment for the inventory items to COGS and also selling those items on an invoice or sales receipt. That will definitely double-count your COGS. Is that what's happening?
If so, you need to make sure you are receiving items using bills or POs. That will properly put the items into inventory and a corresponding amount into A/P. Then, payment will reduce your bank account and A/P. Then, when you sell the item, QB will post, as part of the sale, a reduction in inventory and an increase in COGS.
If you are manually receiving items into inventory by using a quantity adjustment, then your COGS is overstated by the same amount as whatever account has been chosen under 'Adjustment Account'.
