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pavka
I think what the message means is that Piwik shows the ranking of that word for that particular user. Google orders stuff differently for different people, so you cannot say "this keyword is ranked at #18 not #22" - it may be #18 for you and #22 for somebody else.
You are wrong. I try it before post here. This #22 is for me in Piwik and #18 is for me in Google. I don´t know where Piwik found this rank from google.