Arlington County Registrar Linda Lindberg said the erroneous cards were sent to voters in 3-4 precincts before county employees realized the mistakes, which included outdated precinct information (as a result of this year’s redistricting process) and incorrect polling place addresses. The mistakes were the result of a computer that was improperly programmed, Lindberg said.

Voters receiving a second mailing will get a new voter registration card and a letter explaining the errors. Adding to the confusion is the fact that many of the initially-mailed voter registration cards actually contained no incorrect information. An unknown number of the first batch of mailings did contain errors, however, so the entire batch is being sent again.