Social Security Taxable amount

For 2024, turbo tax calculated our taxable social security as 47% of the total.  We trusted the calculation, but the IRS sent a notice that the computation of the taxable amount was in error. The correct amount should be 85% of the total benefit. When I reviewed our 2023 return, I see that last year, Turbot Tax did show 85% of our SS as the taxable amount. This is a huge error in Turbo Tax for 2024! I have been on the phone all day trying to find someone who could help me understand what went wrong.