Paging isn't working right...

OK. Currently I have 11 ads of the type “for sell” benin-services.com/a-vendre . I have the adjustment in backend amongst ads to display by 5. Thus normally when I go to the menu “for sell” I should have the list of the first 5 ads in the page number 1 and the 6 other ads in the page number 2. But it is not the case now, it has neither page number 1 there, nor page number 2… etc .

You can see the image of my site in activity in bottom. Thank you