This is not an mIRC issue. This is how Twitch's IRC chat works. It batches(groups) together join/part/mode events before sending them to users. This leads to text appearing before mIRC is aware of users in the channel.
I don't have links, but there's a few 3rd party programs that proxy the connection between your irc client and twitch to make twitch's chat behave more like normal IRC.
Last edited by FroggieDaFrog; 24/05/15 07:02 PM.