Poll workers in Georgia's DeKalb County will have to manually scan 19,000 ballots after the polling site experienced "technical issues," election officials said Wednesday. 

"Georgia's voting system provides built-in safeguards, in the form of paper ballots, that allow us to quickly process ballots that are electronically cast," Erica Hamilton, the director of DeKalb County Voter Registration and Elections, said in a statement. 

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"These outstanding paper ballots are currently being scanned and the tabulation will be completed as quickly as possible and in compliance with state guidelines."

A handful of counties -- many Democratic strongholds where Senate candidate Jon Ossoff says he is confident he will win -- are still tabulating votes from Tuesday's closely watched runoff election, which will determine the balance of power in Congress. 

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Ossoff is leading his opponent, former Sen. David Perdue, by less than a percentage point as of Wednesday morning. The Fox News Decision Desk has not yet called a winner in that race.

Perdue has said he will "exhaust" all legal options to ensure only "legally cast" ballots are counted.

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Meanwhile, Democrat Raphael Warnock is projected to defeat Sen. Kelly Loeffler, R-Ga., according to Fox News' Decision Desk. Loeffler has refused to concede in the race and has encouraged her supporters to "keep fighting," despite Warnock declaring victory.