Amending 2020 return

Hello,

 

I am trying to amend my 2020 return which is already accepted and I have already received the refund in my account. While amending the return to add my schedule K information after selecting my accepted IRS tax return the numbers on the top left window for federal tax goes red and it shows I owe IRS $500. Yet I have not entered the Schedule K information. After entering the schedule K information (business loss) for me and my wife I see I still owe to IRS. 

 

Can you please explain me the reason behind I end up owing to IRS instead of getting additional refund. Technically I should get more refund as my business loss increase the deduction.

 

Need your help.