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(CNN) – Ordinarily, there’s a world of difference between Sen. Barack Obama, the Democratic nominee for president, and former Georgia congressman Bob Barr, the Libertarian Party’s nominee. But voters tell CNN that machines in Knox County, Tennessee had them confused about which of the two men they were voting for.

“On the summary page, after I voted for Barack Obama, when you summarize before you hit ‘cast ballot,’ it says ‘BAR’ for my vote,” Russ Manning of Knoxville, Tennessee said in one of the calls CNN received about Knox County. With Barr’s name also on the ballot, Manning was concerned that machine was about to incorrectly record his vote for Obama as a vote for Barr. “And, so I had to go back and forth several times to make sure I was voting for the right person. With everybody else on the ballot, the names are completely spelled out but you only get ‘BAR’ for Barack Obama and ‘BOB’ for Bob Barr as I finally figured out.”

Local election officials in Knox County are aware of the issue and are working to inform voters and poll workers about that the unusual references are actually to the first three letters of each man’s first name. "'It’s because of the electors,’” Greg Mackay, the Knox County administrator of elections, told the Knoxville News Sentinel recently. "'It’s just on the president. It says ‘electors for’ on the summary page and the first three letters for the candidate of your choice.’” Mackay also told the newspaper he has received two or three complaints about the summary page of the county’s voting machines during the first week of early voting.

If you have any problems or concerns about voting, CNN would like to hear about them. Call CNN’s voter hotline at 1-877-GOCNN-08 (1-877-462-6608) to report your problem.