It's probably related to this story out of NC:
North Carolina voters report voting machines switching their votes to GOP candidate
A voter in Guilfrord County, attempting to take advantage of early voting in North Carolina, told the News-Record that the voting machine he used repeatedly switched his vote for a Democrat to a vote for her Republican opponent.
Percy Bostick, 69, of Greensboro said he tried casting a vote for Democrat Kay Hagan — who is locked in a tight battle with her GOP opponent — however the machine, located in the Old Guilford County Courthouse — assigned his vote to Republican Thom Tillis.
“I called one of the poll workers over,” Bostick explained. “She said do it again. And again, I touched the screen at the proper place for Kay Hagan, and it again reported it for Thom Tillis.”