Not necessarily. The calculations are based on the idea of trying to have you avoid paying an underpayment penalty for 2021. If the vouchers only covered your 2020 balance due, that would mean that your tax credits and withholdings must be the same for 2020 and 2021. Not knowing your exact tax situation, it is hard to know what may be changing that TurboTax has factored in to the calculation.
Going through the estimated payment section should help you to understand the process a little more. See the following TurboTax article for some additional information: How does TurboTax calculate my estimated tax payments?
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