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It's just the container for all of your projects. Everything is either in the Inbox, or the Library.

Could you have completed all of the tasks for those projects? Change the view bar setting for Availability (the 4th setting from the left) to the first choice, which should show you all actions regardless of their status. If you see a bunch of actions appear in those projects, all marked completed, then maybe that is what happened. Or maybe you never put any actions in the projects?