Good afternoon! Help me figure out the forum. This is the problem of a specific user or something else?
The users did not have a username and the system set automatic them?
Can you share more detail or context about what the image is about?
information about users in the system (forum)
Did you have any weird third party plugins installed? I remember Babble doing something odd like this.
Okay, try loading your site in safe mode, or uninstall Babble (and possibly other non-official plugins) one by one, reloading/rebuilding your Discourse app afterwards and see if any of these help.