Have you added a page tree macro to your sidebar? If you have, that'd explain the duplication.
You can either remove the macro, or follow these steps to hide the default page tree:
Atlassian Summit is an excellent opportunity for in-person support, training, and networking.Learn more
Hey everyone! My name is Natalie and I'm an editor of the Atlassian Blog and I've got a question for you: What's your favorite quote about teamwork? We've compiled a list here, along with...
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
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You're one step closer to meeting fellow Atlassian users at your local meet up. Learn more about AUGs