After you file

We cannot see your tax return.  However, here is how I assess the IRS statements that you posted.

The Social Security number of one or more individuals claimed as a qualifying dependent was missing or incomplete.

The last name of one or more individuals claimed as a qualifying dependent does not match our records.

One or more individuals claimed as a qualifying dependent exceeds the age limit.

A dependent is disallowed as a qualifying child.

Tests to be a Qualifying Child 

1. The child must be your son, daughter, stepchild, foster child, brother, sister, half- brother, half- sister, stepbrother, stepsister, or a descendant of any of them.
2. The child must be (a) under age 19 at the end of the year and younger than you (or your spouse if filing jointly), (b) under age 24 at the end of the year, a student, and younger than you (or your spouse if filing jointly), or (c) any age if permanently and totally disabled. 
3. The child must have lived with you for more than half of the year. 
4. The child must not have provided more than half of his or her own support for the year.
5. The child must not be filing a joint return for the year (unless that joint return is filed only to claim a refund of withheld income tax or estimated tax paid).

Your adjusted gross income exceeds $75,000.

After a qualifying dependent was removed from the tax return, I suspect that you no longer qualified as Head of Household.

The $1,400 Recovery Rebate Credit was not issued because you had already received the third stimulus check.

@Drewtilldeath86