Data centers do not always keep up with the updates as fast as Google do them. The SERPs change on almost a daily basis. If a site is fairly new, it may be high is the SERP for a while and all of a sudden they may drop for no apparent reason.
This is because other sites may have done some updating, better SEO or just your site may have settled down. Unfortunately, the best site does not always make the top, it is the site that does the best SEO and promotes the site the hardest.
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