Did you double check the W-2 after you uploaded it? Since TurboTax does not create the original W-2 but they are created by third parties, sometimes the upload fails. A subtle change on your W-2 could make a lot of difference.
OK, on the Online version, can you see your forms (i.e., have you paid for it)? If so, you should be able to see form 8812 where the CTC is calculated. Now take that 8812 and compare it to your CD/download (desktop) version of TurboTax and mentally fill in the form from the desktop return, and see where it would differ.
If by some chance there already is a form 8812 on the desktop version, this will make your job easier. Unfortunately, since we in the Community cannot see your private tax data, we are working blind.
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