not all categories are showing and view all does not work

I have created 39 portfolio items divided into 1 category and 6 subcategories. The portfolio page is only showing one subcategory, the other subcategory exist (I can open the items from the wordpress backoffice). At first, it showed more subcategories but as I created more, the first one disappeared on the page.

The page I need help with: [log in to see the link]