Update: Finally received the IRS letter explaining the reduced refund. The intent of my post was not to whine, as @macuser_22 seemed to imply, but to draw attention to a possible bug or error within TT.
Indeed, the IRS letter confirms that TT miscalculated:
"We believe there's a miscalculation on your 2020 Form 1040, which affects the following area of your return: Recovery Rebate Credit. We made changes to your return that correct this error. As a result, you are due a refund of $XXX.XX."
Again, TT made this error, not me. I answered correctly and never made any changes.
