If you are missing $1,400 in your refund, you should have received a letter from the IRS telling you that they were adjusting your refund amount and the reason they were doing it.
The most likely reason is because you entered $0 for the amount you received for the third stimulus payment when TurboTax asked you, but the IRS records tell them you did receive the $1,400 payment in 2021.
You can go back and check your bank records to see when you received it. If absolutely did not receive it you can contact the IRS at 800-829-1040.