Doubling of Inventory

I'm new to quickbooks and have been using it to keep up with the accounting and inventory of vintage items we purchase.  With vintage items, we typically only have 1 of the item.  However, we have an issue where quickbooks is doubling our inventory.  This is how I input the items:

1. I scan in an invoice that is already paid which creates an receipt
2. Then I seperate the shipping, fees, and other COGS besides the items themselves in Categories.
3. Select the bank account which the money was taken out of and create a vendor or select one I have
4. Next I list each item in the item details.  I put the cost of the product under Cost of Goods Sold and number on hand as 1.
5. Save and then it creates an expense
6. Then it syncs to Woocommerce via MyWorks
7. Next thing I know Quickbooks has doubled the inventory to 2 and in a few cases it was 12 and now 24.  

This is all being pushed out to Woocommerce, ebay, and etsy causing issues on our channel.  I need to understand the correct process that keeps the doubling from happening.