On the refinanced mortgage Box 2 is asking for the amount of the outstanding balance of the loan as on 01/01/2019. Since the loan did not start until after that the date the amount in Box 2 for the refinanced mortgage should be $0.
If you put a balance for the loan in Box 2 for the refinanced loan the computer program will impose the limits on how much interest you can deduct on mortgages.
Link to Deduction Mortgage Interest
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