Why TurboTax did wrong calculations on my tax return due to long term capital gains?

Turbotax is grossly wrong in calculating my federal tax!   I have been having long term capital gains in past 20 years, but only until 2021, IRS sent me a letter to point out the wrong tax calculations by TurboTax and refunded me a big check. For all those years, nearly 3 decades, I had been so relying on TurboTax, and I might had lost a lot of money by using TurboTax for all those cases where I had long term capital gains. I bet that million users probably have lost tons of money by using TurboTax software. Intuit, please fix your buggy software!

I bet that sooner or later there will be a class action lawsuit against Intuit for the aforementioned matter.

Thanks for your attention!