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@Justanotherphil At least in my case, the explanation @BillM223 gave made sense. Since I bought the audit protection, if the IRS decides to audit me I'll let TurboTax deal with explaining it 🙂 

Ultimately, it was the IRS validation that was failing, and with that change, the IRS validation after I submitted succeeded, so in theory the IRS like that answer more than my original submission.