The "120 second guest" records is not a bug - they are games which held inappropriate record times, by players who were not playing within the rules. I was unable to determine the previous record holder for these quotes, so I arbitrarily set them to large record times which I knew would quickly be broken by registered users. In fact, most of them already have - there were about 750 in total.
So not a bug, and nothing to worry about - just enjoy the easy record-breaking while it lasts, before bansai et. al. get around to solving them again at 10 seconds or faster. :-)