Hello,
As we can see in Ultraman | TVmaze, every individual Ultraman merged into one title. However, Ultraman is different from Ultra Q or Ultraseven etc. They do, are part of Ultraman universe but they are not a one show. Thus, Ultraman is not a 33 Seasons long live TV show, it's a TV show with 39 episodes and have a huge different from other Ultraman shows, such as Ultra Q or Ultraseven etc.
It is advisable to separate Ultraman into each different title like IMDB or TMDB does.
Thank you.