From the article:

Investigation Finds Georgia Officials Decline to Prosecute or Correct the Double Voters They Catch December 15, 2020 RealClearWire

by Paul Sperry

More than 1,700 Georgians were singled out for illegally casting two ballots in 2020 elections – including last month’s hotly contested presidential race – but their fraudulent votes weren’t canceled out, according to state election officials. And so far, none of the cheaters has been prosecuted, raising concerns about continued fraud as Georgia prepares to vote again in twin U.S. Senate runoff elections next month.

The majority of double voters were Democrats who cast an absentee ballot either by mail or drop box and also voted in person on Election Day, officials said, which is a felony under state law.

The highest share of offenders were from Fulton County, which includes Atlanta – many of whom were allowed to cast a second ballot by poll workers, officials said.

My guess is that no-one actually double-voted.

What happened was that the bad guys looked to see who seldom votes, they extracted that list of names and registered a vote for every one of them.

Then, because this was such a momentous election, those people decided that they would vote this time so they ended up with two ballots in the system with the same name.

If they cancelled all the named individuals ballots the scam of voting on their behalf could well be exposed. Least said, soonest mended.

They didnt prosecute because then ppl would find out they were stealing ballots and using them. I'd bet the people didnt double vote, but someone used their mail ballots.