Pagination and last gallery item

Hi,

I have some trouble understanding why the pagination option failed. The last anchor does not display the last gallery

See the example here. Click the last gallery 7.

Only this configuration display the pagination, others no :

Enter the Number of galleries displayed on each main gallery list page : 20
Enter the Number of images displayed on each gallery thumbnail page : 18

Drupal 6 version 1.19

Thanks you for your help

Regards

Fred