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@George4Tacks wrote:

@GLS  It is a math (operator) error. You do not get both. Look at the complete return and I believe you will see that there is a Schedule A. You do not get the $600 in addition to the total Schedule A amount.  I betcha dollars to donuts that you have lots of numbers on that Schedule A, not just the casualty loss. 

Also look for the error check that should tell you this same thing. 

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The Casualty Loss is added to the Standard Deduction.  It is NOT considered as Itemizing.

As was mentioned, I also suspect it is an IRS software error.