ptmuldoon: Not totally sure what you mean. Could you elaborate?

JimP: Thanks for the reply. I don't believe that's the issue, as both documents show the "Before" and "After" spacing as 0, and if I'm not mistaken, that applies to the entire paragraph, not to the lines.

I use styles quite extensively when formatting books, but this is the first time I've come across this issue and am still puzzled.