Adjusted Refund

Hi All, I used Turbo Tax Premier to submit my taxes.  Just got a letter and a $1400 refund check from the IRS stating they "found an error" on my 2021 Form 1040 which affects the following area of your return: Additional Tax.

 

They say they changed my information because the amount shown on Schedule 2 of my tax return as additional tax from Schedule 8812, Credits for Qualifying Children and Other Dependents, because I received advance Child Tax Credit payments and either didn't reconcile them or made an error on Schedule 8812 in one of the following: Computation of the Child Tax Credit on Schedule 8812, The Reconciliation of advance Child Tax Credit payments, or Transferring the amount of tax from Part III to my tax return. 

 

I am single, not married, no children.  I am not claimed under anyone.  How can I verify this? It's a little confusing when trying to back track on Turbo Tax.  Is this related to a $1400 Covid stimulus check I got back in March?