I would've preferred to put a better subject line, but the more accurate one that I tried wouldn't fit.
It seems that mIRC appends that text onto the end of the titlebar. I think that it is automatically pushed off the end of the titlebar if the user-set titlebar text is long enough. In any of my maximized channel windows, I typed /titlebar x and the titlebar showed
"mIRC x - [#channel....blah blah blah..]"
I wonder if there is an option somewhere to disable this automatic text. I don't see one though, so but maybe one should be added.
This quote is in response to my question about that extra text, as it only shows in maximized channel windows, but if the topic is long enough, you don't see that information, and the script I'm working with, creates a scroll of the channel topic.
The scroll works fine if the channel isn't maximized, but if it is, then this extra data is also shown, inspite of the fact that, in my opinion, it shouldn't be as it's not part of the channel topic.
Referencing
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