If you're checking this by doing it in a simple Google search you're unfortunately not going to get accurate results as there are a lot of factors that will tailor the results. 

For example cached history in your browser or cookies can bias your results to get a certain website that you visit often a better ranking. It could also for example be due to your location; as in, you might be getting results specifically tailored to the city you live in.
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Another possible cause is that Wincher only saves the ranking data once per day and as such, the ranking can actually change from the time that the snapshot was taken to the time that you're checking the rankings.