pagination doesn’t work

Hello.
With pagination activated (with a number of 5), we have at the bottom of the page “1 2 3 … 77”. If the pagination is set to 50, we have “1 2 3 … 8). In any case, it is impossible to see any other page than the first 3 and the last. If you click on page 3, it displays well but we do not have the possibility to choose another page than the first 3 and the last one.