Are you sure? It's not on line 28? If you see 3,000 on your return it's not for the amount you got but it's the extra missing amount.
Turbo Tax started out giving you the full amount. So your refund was too high. Then you enter what you already received so it subtracts out what you already got. Check 1040 lines 19 and 28 and schedule 8812.
Do your children show up as dependents and are checked for the Child Tax Credit?
Before filing, You can preview the 1040 or print the whole return
https://ttlc.intuit.com/community/accessing/help/how-do-i-preview-my-turbotax-online-return-before-f...
