Trying to amend my 2018 return, but refund meter doesn't go to zero

Even though other advice on this board suggests the refund meter doesn't matter, the numbers in Column C, rows 20 and 22 are not what I expect. When I checked the original, filed return in TT 2018, the numbers are exactly as they were when I filed them. How can I correct so that I can use the amended return feature?