Since the distribution from the IRA took place while you were a resident of Florida, you are correct, it is considered to be Florida income.
Being a part-year resident of Wisconsin, you should be filing a part-year resident tax return. As you go through the part-year return for Wisconsin, you should see inputs asking to allocate your income between Wisconsin and not-Wisconsin. This is where you would indicate that the income from the IRA distribution was not Wisconsin income.
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