Turbotax told me that the standard deduction was better for me this year, despite my deductions on the comparison/summary pages being the same or more than 2023, which was odd, so I started poking around a little.
Forcing it to switch to itemized deductions and then going back to the 2024 Deductions and Credits summary screen showed $0 in mortgage interest for this year, despite triple-checking that I entered it correctly and answered the questions correctly. As far as I remember, it showed the expected value of my mortgage interest in the summary when it was still using standard deduction, but when I pulled up Schedule A, the mortgage interest info was blank. Adding the interest directly into forms mode fixed everything, turbotax happily says itemizing is better for me, and my refund increases significantly. There appears to be some sort of bug here.
I am not certain how to recreate this but I think the very first time I went through the mortgage interest I accidentally answered that my loan was "neither of these" for the is this a HELOC or refinance. I later corrected that (it's a refinance) and answered No that I didn't use the money for anything but the loan, but it seems like maybe that change didn't "take".