I have recently came across very unusual and weird feature and thus I am not sure whether I get it right.
Quite complicated, so I will present it on an example. Writing post A, I give a link to post B. Just after publishing A, something weird appears in B's comment section. It is a comment containing a paragraph from A. Why? What for? How to switch it off? Example: http://dhost.info/arsud/wordpress/?p=49#comment-10