bb-code css seems to orphan following paragraph

This is probably not a problem w/bbcode but I cd use help figuring out how bbcode css is applied so I can fix whatever's wrong w/my theme.
What happens: when bbcode converts quote tags into "bb-quote" or "bb-quote-body" the paragraph immediately following the quote seems to end up w/no style applied (or it's grabbing some kind of default form the browser maybe). Then the paragraph after that usually returns to the normal styling for comment contents.

(I am using Advanced Forum, but this also occurs if I disable AF and look at it in core Forum)

Can't figure out why this happens. Any guesses? Maybe it would help to paste some source...

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        <p><p><div class="bb-quote"><b>userx wrote:</b><blockquote class="bb-quote-body">Just wondering, what section should I post the thread on that would have the pictures and talking about our wedding?</blockquote></div><br />
Obviously....</p>
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