User blog comment:PKMNthehedgehog/Who's the coolest competition reboot 2!/@comment-3416945-20111027223313/@comment-477304-20111027225415

There was reason for that. As you may/may not know, DBZ is based on a manga series and when they made the anime, not all the manga volumes were made, so they had to strech out the episodes until the manga volumes were finished.