Can you PM me access details of the user who sees that? As our test sites and demo do not have a lot of users in the chat list, so I could check the issue

yes thats why im asking i do not know if is reported and would be hard for you reproduce

il send u pm

i see many problems everywhere and stupid me did not make a list of what i have reported and what i have not 
so most of the time i have wait see if some one else reports it 
which is not a good thing as so many things may not get reported

infact oxwall should have a forum list here on known problems and remove them if and when they are fixed 

would stop multiply posts on problems 
and stop me from lose my hair 

please one request per topic, delete your last comment as it has nothing to do with the title of the post

Tammy, I see the issue on your site, but I could not reproduce that on our side, it takes a lot of time to register so many profiles by the way

I know you're not willing to disable 3rd party plugins on your production site, but maybe you can create a test installation and try to register the same amount of users and we'll check whether such problem exists on default installation of yours without any 3rd party plugins. 

in 1,7,3 i did try disable all plugins and still had the problems 
1.8 and above i have not try disable all plugins 
1.7.3 to 1.8.1 theres stuff all changes to the plugin
i have never tryed the bulk import users plugin maybe that be a help for you to populate a test site as the team will need it to try work a fix for it 

That's exactly why I'm asking you to create a test installation with such amount of users, because I did register 54 users on my test website and I had no problem with duplicating users in chat list