On an amended return it assumes you paid your original taxes due. Then the amended return calculates the new information you entered to come up with a refund or additional taxes owed.
You need to see if Line 16 of your amended return shows the taxes from your original return. If that is showing then you still owe that amount. The amended return is processed separate from your original return. Also, an amended return takes longer to process.
You need to pay what you owe by April 18th to avoid a penalty and interest.
