Fulton County Elections Director Rick Barron admitted that his staff sent the wrong number of voting machines to one precinct, causing extra long lines, US media reported.
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Polls conducted before election day put the race for Georgia's next Governor in a virtual tie between Republican Secretary of State Brian Kemp and Democrat Stacey Abrams.
If neither candidate receives 50 percent of the vote, the state would hold a runoff election on December 4.
On November 6, US voters are casting ballots to fill 435 seats in the US House of Representatives, one-third of the 100-member Senate and other local and state positions. The outcome of the 2018 midterms will determine if the Republican Party can maintain control of both chambers of Congress.