It's likely that it is an error. I don't know if at one point in the preparation of your return you looked at the estimated tax section, but it's possible that generated the vouchers. But again, if your income and withholding is the same or close to the same every year and nothing will change this year as far as you know, then the vouchers aren't necessary, and you should ignore them, regardless of why they were generated by the program.
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