Username with appended numbers

Hiya all, not sure if this was asked before, cant find in any search.

I am seeing some users are getting username with appended numbers i.e. af3-2 instead of af3 in the member's profile/wire messages. Of course, when clicking on the link, it will default to the mainpage instead of the profile page.

My members cant get to their profile :slight_frown:
Any potential fix for this? I am using bp social theme 1.1.2