server cross-comments on it’s own

I suspect this is one of the plugins I have installed, but I’ve searched through them and don’t see any type of option that would be doing this.

In a nutshell I write post “A”, then write post “B” a few days later. Shortly there is a comment for me to approve on post “B” that is from the IP of my server, with no email address associated with it (even though in the comment settings I have it set that email and name must be supplied), and the comment is a snippet if post “A” surrounded by […] blocks and ending with a link to that article.

I haven’t approved them yet. I don’t know if google or whoever would see this and penalize my site thinking I’m just trying to boost my own word count or something.

Any insight?

Here’s the list of plugins I have:

Akismet
All in one seo pack
breadcrumb
Digg this
google analytics
google xml sitemaps
quick subscribe
subscribe2

Thanks!