This is a guess as I really do not know the answer but I think it's the track of the same cat but at different times. cats will take the same trails over and over in their territory and even walk in the same tracks at times. They will walk the same logs and cross at the same spots. I have trapped a lot of cats over the years and these places are good to set traps or even call. Think of the traditional gait that staggers slightly. Now add the same gait beside it and they cross over each other slightly. Love to hear what Hern says about this.