New users link are taking people to the profile of a different user

We have a new user who signed up on our site today whose profile page is not available because when we click on her login on the users page we are then directed to the profile of another user who signed up a year ago.

The user that just signed up used the login of ash37@comcast.net

But, when I click on her profile image or her login link I am taken to the page of this user: https://www.drcarney.com/anne

These are not the same users. There is a mixup.

The new user has user ID: 3392

The page that is being displayed belongs to a different Anne who is user ID: 2978

It appears that somehow both of these users were assigned the same url on the site.

The first user set up her perma-link as /anne

The second user put in her name as only Anne and did not set up a perma-link.

But, it appears to have been assigned to her by default. The system did not warn that somebody else was already using the perma-link.

Sean

PS. i AM AFRAID THIS MAY NOT BE THE ONLY INSTANCE OF THIS PROBLEM AND HOPE YOU CAN HELP ME TO VERIFY THAT THIS HAS NOT HAPPENED TO ANY OF OUR OTHER USERS. :-)