1099-Q

I am a grandparent who has a 529 account for a grandchild.  I have taken distributions from the 529 account for the last four years to help pay for qualified education expenses.  I make my payments directly to the college so they always equal or exceed the distribution so I have good record keeping of where the distribution goes.  I am the recipient and the grandchild is the beneficiary.  In 2021-2023 I always entered the 1099-Q in TurboTax and it never affected the amount of federal tax I had to pay.  Now I have the 2024 TurboTax program and I am entering the 1099-Q as I have for the last three years, but now it is making some of the distribution taxable and increasing my federal tax.  The grandchild is not my dependent so I can’t enter expenses to offset the distribution.  I have talked to Tech Support and had the live online support that I paid extra for.  No one can explain why the program is doing what it is this year and the best advice I got was to not enter the 1099-Q on my tax form.  This is an option, I guess, but why did it never have an effect before and this year’s program is doing something different?  Help is appreciated.