Confusion about box 7 on Form-1098

We refinanced our home in November of 2020. Previously we had two mortgages on the house and for years we received the both lender's 1098 form with box 7 unchecked and box 8 populated with our address. For 2020 we also received  the third form-1098 for only one month payment from the refinanced lender (the combined our two mortgages in one).

 

In the form 1098 provided by the refinanced lender Box 7 is checked and box 8 is empty. When I tell TurboTax box 7 is checked the amount I owe to Federal government goes up by thousands of dollars. I am a bit confused why this happens and only for one month payment statement.