Google just updated its search algorithm, with the goal of ever: to offer better results. Caffeine Google Google Panda lead to the penguin.
Want an example? If you search for “mochila hello kitty” you will see that the first three results correspond to the Hello Kitty official store. Indeed, a website created by us and positioned us. This means that on the first results page, instead of being 10 domains, there are only 7. Google will restrict this possibility, so that the Hello Kitty will continue to be the first in Google but will appear just once.
It is a good way to improve the quality of Google search results.