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Can anyone shed light on how this can happen?
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Basically as google and yahoo crawl the web they find links to and from pages. They record these links and display them when you do a link search. These link results are only updated every 4 - 6 weeks on google, and yahoo updates them much less often.
Google often has datacenter glitches and will show inaccurate PageRank. The tool bar is fed from a certain google datacenter, so if the datacenter is doing anything abnormal you will see inconsistencies.
PageRank is based on incoming links, the topic of the site has nothing to do with the PageRank.