Year range Sherlock Holmes and Doctor Watson

Currently, Sherlock Holmes and Doctor Watson has a year range of 1980-1980 (https://www.imdb.com/title/tt0298697/reference/)

However, there are episodes from 1979 listed as well: https://www.imdb.com/title/tt0298697/episodes/?season=1

These sites also state the year range should be 1979-1980:

-https://www.arthur-conan-doyle.com/index.php/Sherlock_Holmes_and_Doctor_Watson_(TV_series_1979-1980)

-https://www.youtube.com/playlist?list=PLFR78Uf6Xh3hTVdlqMJZIQg3NacYI6Udw

Can a staffer fix the year range to 1979-1980 please?