Let's say for example someone wrongly adds a track to recording with any times attached to it.

The wrongly added track gets fixed to its own recording, however the remaining recording with a single track with no time, now retains the track time of the wrongly added track (and in this case the times will most definitely be wrong as the wrongly added tracks were from a DJ mix relesae).
Examples:
http://musicbrainz.org/recording/f599edc7-9df9-4514-8c59-56b1806bc434
http://musicbrainz.org/recording/b46bb478-2544-47c7-ada0-1331378f9e14