You did not follow the math. When you mis-stated and said you only received $600, the software added $600 to your refund. You were not entitled to that $600 since you really received $1200. So when the IRS checked to see how much stimulus was sent to you, they recalculated your inflated refund and took the extra $600 away. Letting you keep it would have been "double dipping" for you.
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