We’ve been aware of general issues along these lines and I believe some changes were effected in our last release to help with this. I do notice however that on that URL dated 2003 the robots meta tag is instructing bots to index them (it should be instructing them not to) – I wonder then if some other facet of your system is interfering here.
You can basically see this by going to that same URL and viewing the source. Where you see:
<meta name="robots" content="index, follow" />
I would expect to see:
<meta name="robots" content="noindex, follow" />
Can you confirm if deactivating all other plugins and switching to a default, unmodified theme resolves this?