If you have a role that lets you create or modify Projects in Bonfire and you also act as a Reviewer for Projects, you might find these two tabs under the Active Projects section:
Any projects showing under the Evaluating tab are projects that you were actively added as a Reviewer for.
Any projects showing under the Active tab are projects that are part of your Department.
These tabs are separated since sometimes, you might be a Project Owner but not necessarily a Reviewer for that Project, or vice versa, where you might not be the project owner but you are Evaluating that project.
Open, Completed, or Evaluating tags for these projects is a way to show you the stages of the projects.