Even MORE not recognized

Why do ALL of my Plastic Man comics from 1976/1977 - issues 11-20 - have title listings as “64 Pages of New Captain Marvel Adventures” with the corresponding issue number. They are clearly not 64 pages of new Captain Marvel adventures. They are Plastic Man. These aren't the only comics I've scanned to pop up erroneous titles either. How did you arrive at this outcomes? It seems pretty simple that Plastic Man is Plastic Man and not Captain Marvel - not any of them.