The Haunting (of Hill House) Film Tie In

The June1962 Popular Library movie tie-in edition of Shirely Jackson's 1959 original (here sold for 40c instead of the $3.95 Viking Press hardcover. The Haunting is copyrighted as 1963 on the cover, interestingly, and the film wasn't released until September of that year. The most logical explanation for this is that the publishers accidentally stated 1962 instead of 1963 as publication date. Anyone know more?