I think I'm on the trail.
theTVdb has episodes of Dark Shadows (1966) listed as 12 different seasons, IMDB has it listed as 1225 episodes in one season, and Wikipedia lists it as 5 seasons - 1966, 1967, 1968, 1969, 1970 and 1971.
It's pulling metadata from IMDB, but I have it split and named as per theTVdb.
Fixed. I had them numbered sequentially and continuous because of the weird way that DS numbered their shows to end in a 0 or a 5 at the end of the year.
Had to renumber with a 1 at the beginning of each season.