Trouble with getting postbit to fit

[petertdavis]

I am working on getting a forum style setup. It fits like I want on the forum index, the forum pages, etc, but when I look in a thread it doesn't fit.

example 1 - fits fine
http://www.bonnevilleforum.com/index.php

example 2 - fits fine
http://www.bonnevilleforum.com/forumdisplay.php?f=93

example 3 - doesn't fit
http://www.bonnevilleforum.com/showthread.php?t=276550

Now, I don't see anything in that thread that would cause the content to not fit within the margins. In fact, it does that in every thread, no matter what's the content of the thread.

Does anyone have suggestions on where I should look for a setting to make the threads fit?

Thanks,