Amended return shows I owe money before I change a thing

I need to file an amended 2023 return because I received a revised 1099 after I filed. When I open up my return it says I owe $1600 in federal taxes and $0 in state taxes. When I initially filed I owed quite a bit more than that for state and federal, so I should owe zero now. It even says, "Why is my refund zeroed out?" Mine should be zeroed out, but it says I owed. When I compared the filed 1040 to the 1040 in the amended return the numbers are identical (as they should be since I didn't change anything yet). Any idea why it would show that I owe money? Thanks.