Welcome to the Q&A Forum

Hey Antony! I checked out your account and can't replicate the issue that you're seeing. I think you're talking about running an On-Page report for a URL/keyword combination. As far as I could tell, the only type of cannibalization you could get a warning for is keyword self-cannibalization, where it looks like keywords are being targeted for multiple pages instead of a single page on your site. As you probably read, we suggest staying away from linking internally to another page with the target keyword(s) as the exact anchor text, as well. We should be crawling a full path URL in the same way we crawl a relative URL, so if it's changing solely based on you modifying the URL in your search, I'll need to see what's going on. Can you either post an example of the URLs and keywords you're seeing this for or send that information over to help (help@seomoz.org)? The more information and screenshots you can send, the better. Thanks Antony!