

There are plenty of titles released that are no longer considered part of the canon timeline such as Castlevania: Legends, Castlevania: Circle of the Moon, and even the recent Lords of Shadow series.

In fact, the upper echelon of Konami's leadership has defined the timeline in that they have rejected some of the games. But Castlevania has a canon timeline that is decently straightforward it's just that the games all released in random years. Just ask The Legend of Zelda creators or Hideo Kojima with his Metal Gear Solid games. Video game franchises that span decades can often get a bit wonky when it comes to timelines.
