I find it strange that the Jedi Knight, Force Unleashed and Red Squadron games are in a separate speed running series than this one. Is there a particular reason for that? Shouldn't they all be together? All other series of games are together...

They probably should be together. All but Jedi Knight have only 2 or 3, and if they have their own series then Super Star Wars and Battlefront can too.

This'll likely be resolved once the game tags update is rolled out.

It's difficult to logically describe games as being in the same series if they use the same intellectual property but are different in every other way, including genre, developer, and publisher.

But now that games can be in multiple series, there's no reason each game can't be in the Star Wars series while also having their own unique series, as well.