You always owe your correct income tax.
If TurboTax makes a mistake, the company will cover interest and penalties, but you always owe your own tax. If you fail to report something or provide incorrect information, that is not a TurboTax mistake.
It sounds like you failed to report your stimulus payments. If the IRS thinks they sent the payments but you never received them, you have to trace the lost payments, rather than claiming them on your tax return.
