Yes, this is a poorly worded interview screen. The screen shows the total on the federal return, then asks you for the amount of interest and dividends for the other state. The column that is headed with "Georgia" should actually read "Federal".
As such the left hand column should not be editable because it came from the federal return.
As you note, after you enter the Other State's amount, then on Schedule C on the Georgia return, the amount you allocated to the Other State is allocated to the Other State, and the remainder is allocated to Georgia. Then the Schedule calculates the ratio of incomes before applying the Georgia Standard or Itemized Deduction and the personal exemptions.
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