All Google rankings fluctuate. Google make many changes to their algorithms and it’s important that you stay up to date with their changes. A drop in positions isn’t always down to something you have done, it could be that Google are now valuing a competitors site more than yours. Our job as your SEO consultants is to review an changes in position and help you get back on top. You also need to remember that your rankings can also be different is searching on different computers in different locations, this could be down to the search history on that computer or that Google thinks that people in that location want a different result.