When you go through GA, it asks about every bit of income you earned and asks you to allocate it to GA or other state. Please go back through and review those entries. It is time consuming to go through everything on the return; but, clearly worth it.
If you are still unable to correct the problem, there is a cheat but it should be last resort. On the Here's How Georgia Handles Income Differently screen, the bottom selection is for GA subtractions from income. You could enter NON GA MISC and the amount.
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