@pablop.
You can correct this in the zp-config file. At about line 98, look for:
`// Paging options:
// Control of their display is done in the theme, so you might need to change these
// after switching themes to make it look better.
$conf['albums_per_page'] = 5;
$conf['images_per_page'] = 15;`
That is what controls what you see. You can just change 5 to 6 and that should correct what you want.
Good. Another question to add to the FAQ.