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We're having a similar issue, but the exact keywords are in the content, page title, and Header tags. The site is hitchweb.com and the keyword is "trailer hitch".  Is it an issue with our site, or is it a common problem with the on-page optimization tool? Thanks!

I'm not exactly sure about the SEOMoz error - but your site is doing a strange redirect when I load it up, going to this URL: http://www.grass2greens.com/Grass_to_Greens__Asheville_Edible_Landscaping.html It looks like you've setup a CNAME in your DNS settings to do that - which could potentially be confusing the SEOMoz crawler.  Any reason in particular you set it up that way?  Most people just set their homepage to be www.domain.com/  and have domain.com redirect to www.domain.com using an 301 redirect.