Turbo Tax is a self prepared return. It has no way of knowing or checking that you entered something wrong or in the wrong place or entered something twice Or left something out. It doesn't check against any outside sources. The IRS has copies of all the W2s and 1099s your employer and banks/brokers, etc. sent in to match against. Turbo Tax only checks the calculations of what you entered. It is your responsibility to check it over before you file.
Did you see these screens when you filled out your return? You had to answer this screen right. See Critter's screen shots
https://ttlc.intuit.com/community/after-you-file/discussion/irs-notice-error-in-2021-form-1040/00/27...
Turbo Tax can't look at your bank account for all of last year to see if you got the 1400 3rd Stimulus payment that was sent out last March 2021. You had to enter it.
