No, this is not a known TurboTax problem.
Since we can't see your tax return in this forum, click this link for more info and a calculator for the Child Tax Credit.
Check your Form 8812 for the calculations of your Child Tax Credit that appears on Line 28 of Form 1040.
If you are using TurboTax Online, you will need to pay for your return to view Form 8812.
Be sure you indicated that you lived over 6 months in the US and that your dependent info is correct.
Be sure the amount of Advance CTC you is entered is correct, per your IRS letter 6419.
The amount of your refund could be limited by your income. There is a video at the beginning of the Child Tax Credit section explaining this.
[Edited 1/24/2022 5:57 pm]
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