That's probably because the forum has a maximum word length to prevent massive horizontal scrolling, unfortunately sometimes code can have quite long lines. Try PMing JPnyc about it he could probably increase the maximum word length to 1000 or something, high enough that it doesn't affect code that is posted.
Neither am I. I posted a string of 200 numbers, "0123456789" 20 times over, the forum put spaces in every 50 characters. It just so happens that it also got split into a couple of lines, but that's the browsers default behavior. If you look carefully you can see that after the first 50 characters there is a space, I didn't put that there.