There is no error. The Form 2210 calculation does not include estimated payments. Line 6 of Form 2210 says: "Withholding taxes. Don’t include estimated tax payments."
The IRS is a pay as you earn system so if your withholding doesn't meet the test of 90% of the tax for the current year, or 100% of the tax shown on the return for the prior year, whichever is smaller, then you will have to spread your withholding more evenly with your income to avoid the tax penalty.
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