Bad calibration causing a “touch” over one candidate’s name to register as a touch on a different candidate’s name, would be my guess. I would only guess that because my car has a (annoying) touch screen that requires recalibration every time the battery is disconnected. It makes you touch a target on the screen four times to register your touch point.
ETA: As @sirdigbypollo points out, my guess is wrong. If it was registering the touch wrong, it would show up wrong on the printout. Hmm.
