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If you are referring to Google Search results being different to your previous experience, then this is quite common. It means that for a search phrase Google isn't bringing in your site at the same position as previously and this could be because of an increased number of similar sites, higher ranking sites than yours, or it has reviewed the criteria it uses to pull your site up in the SERPS.
It just requires extra work and a fairly constant addition of new information to your site to keep it fresh and relevant to search phrases.
It's always good to check on your SEO program and once again Yola have some information that can be used as a good resource for this: here.