Those are generic reasons why they adjusted the Recovery Rebate Credit on your return.
A common adjustment is if you claimed the Recovery rebate credit on 1040 line 30 when you already got the Stimulus payment or got the second one after you filed or reported the wrong amounts or entered the wrong amounts in the 2 boxes. If you entered the total you got for both rounds in the same box it would think you didn't get the other one. The IRS knows how much they sent to you and will take it off your refund (or send you a bill) if you try to claim it again.
So how much is on line 30? Did you already get the full Stimulus for 2020? Should you have an amount on line 30 to claim any missing Stimulus #1 or #2? When did you file? If you filed before Feb 12 there may have been a glitch in Turbo Tax that put a wrong amount on line 30.
