I'm guessing PHPBB detects them and shows them as "in trawl" mode hoovering up all the new articles for their search engines. I think there's a setting inside the admin panel to either hide them or something .. will have a proper look at some point.
My main site: http://www.mug-uk.co.uk - slowly digging up the bits from my past (and re-working a few): Atari ST, Sega 8-bit (game hacks) and NDS (Music ripping guide).
I develop a free Word (for Windows) add-in that's available for Word 2007 upwards. It's a fix-it toolbox that will allow power Word users to fix document errors. You can find it at: http://www.mikestoolbox.co.uk