The final deductible amount of mortgage interest isn't correct

Hi,

I have 2 mortgage loans, and I payed interest $30,000 and $10,000 for each.

Total amount is $40,000 and I can see this amount in the deduction summary.

But, this amount is going down to $20,000 after analysis.

but somehow, it's way lower than actually summation of 2 mortgage interest I payed.

I did not see this thing last year when I did tax report for 2019.

Is there anything I'm misunderstanding or I can correct?

Thank you in advance.