While it doesn't pull directly from Line 13 of your Form 1040, the result of the tax calculation for Line 8 of Form 2210 is very often exactly the same number as Line 13 on Form 1040.
Both forms are calculating your total tax liability for 2018, and while they use different methods they should arrive at the same number for total tax.
Form 2210 can have some additional adjustments to this number, but it is very often the case that the numbers are identical. This doesn't mean it is adding in that number, just that it is arriving at the same result for the total tax as part of its calculation.
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