After purging more than 300,000 voters from the rolls, Georgia election officials have restored roughly 22,000 of them.
Secretary of state Brad Raffensperger’s office said Thursday there had been an error in the way their voting history was screened.
Raffensperger’s office said the issue stemmed from the way the process of maintaining the voter list was carried out in 2015.
Election officials on Monday purged 308,753 voter registrations that were deemed inactive.
A voting rights advocacy group founded by Democrat Stacey Abrams filed an emergency motion seeking to stop part of the purge.
A federal judge is set to hear arguments on it Thursday afternoon