Downloaded the new form 4684 today & entered my Hurricane Irma losses. It seems to be deducting the loss on both schedule A & D (I'm itemizing deductions). Really?

I'm having a similar problem. Filled out the casualty loss form for Hurricane Irma & my return was rejected because I have capital loss carryovers and sale of business property but I don't have capital or a business. I don't think you are missing anything...sounds like a software problem. I'm using TurboTax Deluxe 2017. You will have to contact TurboTax by logging in at the start screen, click on HELP then at the bottom of the pull down screen, click on CONTACT US, describe your problem then they will ask for your phone number. 

I'm experiencing the same issue in that it's turning it into a Capital Loss Carryover and a Sale of Business Property when it was a personal home.  TurboTax is defintely filling something out wrong.  I haven't paid yet so I don't have access to look at all the forms it's done to see the exact issue though.

I went looking at the actual tax documents from the IRS and it should just be adding it to Schedule A 1040 line 28 which is the MISC area.

Schedule A 1040 = Other Miscellaneous Deductions - 28 Other—from list in instructions. List type and amount

From 4684 line 15

If you have qualified disaster losses subject to the $500 reduction, subtract line 14 from line 12 of the Form(s) 4684 reporting those losses. If the result is zero or less, see instructions. Otherwise, enter that result here and on Schedule A (Form 1040), line 28, or Form 1040NR, Schedule A, line 14. If you claim the standard deduction, also include on Schedule A (Form 1040), line 28, the amount of your standard deduction (see the instructions for Form 1040). Do not complete the rest of this section if all of your...

The only time Schedule D would be filled out or it treated as capital gain from this is if you did 1040NR but I'm a US resident.

1040NR = 14 Capital gain or (loss). Attach Schedule D (Form 1040) if required. If not required, check here