BuddyPress.org

@armandmorin I don’t think it is a plugin, just some functions which show members activity like “total number of posts/replies/comments”, etc, etc.
Have a look at https://buddypress.org/community/groups/how-to-and-troubleshooting/forum/topic/how-do-you-show-a-members-total-post-count/
BTW, your post does not show your username, just your avatar/pic. I can see the username of who started this topic but not yours…new layout quirks ?