Thanks for your bug report. I was able to reproduce this. This behaviour is present for quite a few other settings where a change to one server/channel/query/etc. window could be applied to a similar window on another server connection. The question is, is this what the user wants in all cases? For example, logging, timestamps, fonts, etc.
Technically, in your situation, mIRC could apply the event change in that channel immediately to all matching channel windows on all open server connections. Is this what you are expecting?
If not, it might not make sense to open the events dialog in the second channel and find the settings are different to what the channel is currently using.
