Hi. In general, tvdb is free to use their own orders. The order you're reffering to is a bit weird since the aring keeps going on their "S2" as it finished on "S1". I don't see the reason for those 3 seasons. Regardless: Our plan is to use one season for all episodes since thats how this series aired originally. HxH only has 1 season of 148 (tvdb lists 150 episodes anyways so in this case its not a very good source) episodes. We will have to wait until we can merge them.