Yes, you can write off the interest paid on both loans.
Please check the information you put into TurboTax for the second loan you took out. In box 2 it is asking the balance of the mortgage as of 1/1/2019. The answer for that box is $0. If you have the $650,000 in that box that is why the program is reducing the amount of your interest deduction.
Change the amount in Box 2 and the full amount of mortgage interest you paid in 2019 will be deducted.
Link to Mortgage Refinance Tax Deduction
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