No the amount you already got should not show up on your 2021 return at all. You already got that. Only the missing amount you didn't get should be on line 28.
Turbo Tax starts out giving you the full amount. So you might see a high refund. Then you enter what you already received so it subtracts it out. Check 1040 lines 19 and 28 and schedule 8812.
How to enter the Child Advance payments you got
https://ttlc.intuit.com/community/family-tax-credits-and-deductions/help/how-do-i-enter-my-advance-c...
