Dates?

Did the show go on hiatus for five years? The dates of this show's run, on the IMDB page, are in conflict; up at the top, it even says it lasted until 1962! However, what I'm really talking about is the big gap in the chronological list of episodes, between 1952 and 1957. And the cast list says that both Kirby Grant and Gloria Winters appeared in 72 episodes, which makes no sense for a show that allegedly ran from 1951 to 1959, or '60, or '62.