Interest on a Second Home that is not a rental

I own a home now that my elderly parent lives in, I visit.  I do not rent it out.  I dropped in mortgage interest from 1098, I saw my return change then when I finalized the entry it dropped back down and had no impact.


I don't know why it did not work, with other deductions I should not be using a standard but it is pulling that in.

 

Not sure how to fix or if I am wrong to think interest on a 2nd home it a valid tax deduction, my reviews show it should.