Two out of 7 Links to picture gallery not working

Hi,

Something strange has happend at

https://www.singsingvillasatbali.nl/

There are two Dutch pages that show no content:
https://www.singsingvillasatbali.nl/index.php/villa-bayu-pictures/
https://www.singsingvillasatbali.nl/index.php/villa-jawa/

But when I edit these pages, they cleary show that there is content on these pages.

Can you explain what is going wrong?
THanks

Godert