Pagination doesn't work correctly

I have a problem using the pagination in my table. I have some data to show, 100 aprox, and I want to show 10 per page, thats ok, but in the bottom of the table it doesn't show the number of pages that I have, instead of that It shows "<< >>" without numbers, just the arrows, and If I click on the right arrow it loads all the remaining data. Someone knows waht's happening?
Thanks!