Year range Circus Boy

Currently, the year range for Circus Boy (https://www.imdb.com/title/tt0048855/reference/) is listed as 1956-1958.

However, as you can see on its page, all episodes are from 1956-1957.

TMDB also has a year range of 1956-1957: https://www.themoviedb.org/tv/14286-circus-boy/season/2 

So does thetvdb.com: https://thetvdb.com/series/circus-boy

As well as TV Maze: https://www.tvmaze.com/shows/4267/circus-boy 

And epguides: https://epguides.com/CircusBoy/ 

Can a staffer look into this and fix this please?