It turns out there's an on-going Team Calendars issue that was purportedly fixed in version 3, but I'm running version 4.
We have events mapped on the calendar for projects with extremely long durations which I believe is the cause. Please hop on over to this JIRA issue and vote it up:
Do you use templates with Confluence? Take part in a remote 1-hr workshop. You'll receive USD $100 for your time! We're looking for people to participate in a remote 1-hr workshop...
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!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
You're one step closer to meeting fellow Atlassian users at your local meet up. Learn more about AUGs