I just realize that there is already that problem and it was resolved (by wrong search). So, when i did the update, I updated nginx too. So here the post :
Hey, can anyone tell me how can I forward the real IPs to NodeBB when running the forum behind nginx proxy? At the moment, every user has the local IP 127.0.0.1 displayed as the ''Recently Logged In IP''.favicon
So it solved.