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here is the reference https://www.google.com/?gws_rd=ssl#q=sarshopping
Google's ultimate goal is to improve user experience, in most cases, certain inidividuals construct poorly written titles that are overly optimized for desired keywords. It is for this reason that the search giant tries its best to match your queury with the ultimate titles and of course, content. As webmasters, we should focus on provisding the most valueble information on the internet in our respective industry or for clients.
Google will sometimes create its own title if it finds yours to be lacking. If your title tags are short, over-used, poorly written, stuffed with keywords,... they have more chance of being replaced.
