Deductions & credits

So I used TurboTax to do my taxes and I was supposed to get $3,402 back Apparently after it was submitted accepted by the IRS then it was dropped from 3402 down to just $402 apparently there is an error on my form 8812 something about an error in the Computing are transferring of information from my 1040 to my 8812 TurboTax did my taxes and TurboTax said my refund would be $3,402 I have double-checked and triple check my 1040 and it's correct everything is right nothing is wrong I even did my taxes just on another software program just to see if I got the same amount and I did I didn't submit it but I did get the same amount back as a refund so what's the issue I can't find it anywhere in my return