Judging from your description, I believe there are some duplicate user info content created for the same user in your Confluence database. The detailed cause and the solution is explained in this documentation.
Since you are using an Ondemand instance of Confluence which are hosted by Atlassian, I suggest you to contact our support team so they can assist you in solving this issue.
Hope this suggestion helps!
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