Problem in the product grid on the home page

[corpsys]

I have problem in the product grid on the home page, because a product does not appear and when I click to show more products he repeats the products.

See print`s screen:
http://postimg.org/image/xylaqtnzz/
http://postimg.org/image/6angr3owz/
http://postimg.org/image/6x9dfslth/
http://postimg.org/image/tspwiz5ld/

How do I get always the latest products created are the first to appear in all grid products?

[Author]

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