If there is google ads on your sites, please make sure that your page meta tag (like "<meta name="..."> <meta content="....">) is flat ,the flatter the better,do not put too much different keywords in it,and you should make sure the keywords are related ,after that make sure that the content is flat too.
I don't think Google takes much consideration of meta tags these days. It pays much more attention to title and the copy itself.