They adjusted my refund from $8,725 to $3,925(-$4,800). I have three kids claimed on my 1040 all with Child Tax Credit checked. I did claim the Adoption credit this year. Could this be because of the order the credits were applied in? I get the same refund when plugging my numbers into other tax software too not just TurboTax, so it seems like this is IRS related
Here is information about your notice. If you don't have the corrections yet, you may be able to get your IRS Transcript with the changes they made. If you do have the numbers compare them line by line with your tax return.
You can call the number on the top of your notice and they may make adjustments if they agree with you.