If you added income, and you doubled the refund, there's one possibility.
Did you get any of these credits:
They are all non-refundable, which means they are only good to reduce your taxes to zero. Once your total tax amount reaches zero, the credit awarded stops.
By making your deduction smaller, you would owe more tax. Any credit not used could then be activated.
This would account for your income going up, and your refund also going up.
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