Why did the same letters print twice?
Whenever you click the blue "Download and print these letters" button, all letters in the "Letters to Print and Prepare" column will be part of the PDF you create and later print. This includes letters that you've already printed if you did not mark them "prepared" before "adopting" more voters.
To avoid printing duplicates, please download and print the batch(es) of letters for the voters you "adopt," and then use the buttons to mark all of those letters "prepared" before "adopting" more voters. If you mark letters "prepared" as soon as you download and print -- and before "adopting" more voters -- the letters you've already printed will not print with your next batch(es) of letters.