A Medina County elections official says "human error" caused some early voters to get the wrong ballots.
Elections administrator, Patricia Barton, says the Natalia Independent School District provided her office with a map that was difficult to read.
As a result, some voters living within Natalia ISD boundaries were given ballots which did not have the race for the Natalia ISD school board.
Several voters caught the error over the weekend and alerted school board incumbent Eric Smith.
"When you're a full-time elections administrator and you have a full-time job year-round, why do you wait a week and a half into early voting to realize you need a better map?" asked Smith.
On Monday the elections office asked for a clearer map from the school district, and officials have begun to make sure future ballots match the school district's boundaries.
As of Monday afternoon, more than 6,000 people had already cast early ballots in Medina County.
Smith is one of three incumbents facing off against five challengers for the three-person school board.
"Make sure you're getting the right ballot," said a frustrated Smith, who has already contacted the secretary of state about filing a formal complaint.