My categories won't appear in my filterable portfolio

Hello everyone,

I've search everywhere but haven't find anything yet.
On a restricted page I've created a filterable portfolio with my four categories. They appear when I'm in the builder interface but as soon as I quit the builder interface and go to the normal page, categories disappear. I don't know what to do to keep them visible...
The website is http://webinr.fr but it won't be helpful as this page is accessible only with a premium account.


Here is what I see when I'm building the page (there are only 2 categories visible because I haven't uploaded any video in the two other categories yet)

Here is what finally appears when I save and I quit the builder


any ideas ?
Thanks !