The IRS will send a notice to explain it for you. Sometimes they may make adjustments on their own, but they will let you know why. TurboTax has no way to find out why since they do not provide any further updates to us once they accept your return.
Per the IRS: "When the amount of the refund (paper check or direct deposit) is different than what was expected, indicating the IRS changed the amount, a notice explaining the adjustment is mailed to your address of record. Please review the information in the notice to determine if the change to the refund is correct. If you receive a refund to which you're not entitled, or for an amount that's more than you expected, don't cash the check until you receive a notice that explains the difference; then follow the instructions on the notice. A toll-free telephone number is included on the notice in case you require further assistance."
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