After some more checking and looking at last years (2020) tax instructions, I believe they are using last years instructions on that last final review. In 2020 $300 was for married filing jointly and $150 for single. Back in 2020 tax return it was on line 10B.
Turbotax 2021 has a bug in final review using last years amounts. The bug is not in first federal review of 2021 or just not checking that field.
