As much as I don't want to defend confluence here, or anywhere... The front page of your confluence instance's default space was configured by someone to show

As much as I don't want to defend confluence here, or anywhere... The front page of your confluence instance's default space was configured by someone to show the all-activity feed. You should be able to go in to your profile, and set your default space to a more specific and useful 'space', maybe your teams space. While you're looking at your profile, you should also see a more tailored activity feed. I can't help you with crucible.