What is double-taxed income in "Summary of Taxes Paid to Other States"?

The credit is automatically calculated, but I was wondering if it's possible that Turbo Tax miscalculated the "Double-taxed income" amount after completing the nonresident return?

 

The "Tax Paid" amount it transferred over was correct, however the Double-taxed Income amount it transferred over seems odd, and I wonder if I need to correct it.

 

It's an amount that's not "Total 5% income" nor "Taxable 5% income" from the Summary of Taxes (MA non-resident, I am NJ full-year resident).

 

Instead. when I preview the PDF of my taxes, I see that that the amount Turbo Tax automatically calculated as Double-taxed Income is from Line 3 from 2023 Schedule NTS-L-NRPY, which was Total 5.0% Income minus an Adjustment to income (which was Line 10 of 2023 Schedule Y ---> Student Loan Interest).

 

I was under the impression that Double-taxed income was supposed to be the "Taxable 5% income" amount?