To understand the problem you have to know how search engines determine a page's importance. There are in any other search algorithm with its own myriad factors that influence the ranking and importance. In addition to the developers that are unknown. With experiments can be formulated up to conjecture. There are several possibilities. I go out in here, because back to the first sentence, I would like to describe here only briefly, can seem like a solution. The major search engines have now agreed on a day that can be put in the header of the page to pass the correct URL for the search engine visited the page.
Code:
One sets the <head> his side following code: <link rel="canonical" href=" URL/ />.
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