Grumble Grumble Grumble
It looks like all of the series you've mentioned have committed the very common Anime sin of catchig up with the ongoing Manga series that their based on... When this happens, the directors and produces have the following choices...
- Wrap up the series incomplete
- Make your own ending, (Which makes the Manga fans very unhappy)
- Make filler episodes (which is hard to do for a series budgeted for a finite number of episodes!)