Is the amount sent/issued by the IRS the same as the refund amount shown on your federal tax return Form 1040 Line 35a? - https://www.irs.gov/refunds
If not, then go to this IRS website for information on reduced refunds - https://www.irs.gov/taxtopics/tc203
TurboTax would have no information concerning who or who did not claim a dependent on a tax return.
