Once a return is accepted by the IRS, no one (including TurboTax) gets any more information except you.
As super helpful Community member @SDun12 said, the IRS will send you a letter explaining any adjustment. They are short staffed. It is difficult, and often nearly impossible to speak with someone over these.
You can check your RIS Online Account to check the amount of your original stimulus payment and see it that's what you claimed. If the number is different that may be the reason for the adjustment.
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