Sounds like a particularly nasty data bug. Does that sitelink show up in your Webmaster Tools account? If so, you can veto it. If not, you could take the issue up on the Google Webmaster forum or try a reconsideration request.
I also noticed this for SES conference site prior to SES San Jose, where some of their specific show pages on a unique directory had Sitelinks pointed to various sponsor sites. Are the links being pointed-to also being linked-out from your site Gosman? SES ended up setting up different WMT accounts to manage the sitelinks being granted to each show page. (search SES Chicago and you will see an example of the directory-level being granted sitelinks)
another problem I had for about 3 months with one client was a sitelink showing up live, but not in the WMT account. this just recently disappeared.