IRS reduced the refund by the recovery rebate amount tax year 2021

I recently did my father's taxes with Turbo Tax.  His taxes are straight forward so I followed the guides.  Made sure I added in the $1400.00 recovery rebate in the program.  I submitted his taxes and noticed the IRS reduced his refund for the exact amount of the rebate.  This same thing happened last year so my question is why is Turbo Tax not calculating the correct amount because if memory serves the default was $1400.  I know for a fact he received the $1400 because IRS sent a letter and he confirmed his deposit with his bank.  Please advise because I want to make sure his taxes are correct and that I don't need to file an amended return.  Thanks