Slider, carousel and gallery

When I try to set one of the shortcodes for a slider, carousel or gallery, the pictures don’t show on the website when I select a category as the source of image while they show on the shortcode preview.

Would you know how to fix this?

https://new.troublesdapprentissage.com/?page_id=1653

https://new.troublesdapprentissage.com/?page_id=1568

Thanks!

https://www.ads-software.com/plugins/shortcodes-ultimate/