CSS display problem on page

Hello,
I need your help. I’ve created a page type with CPT UI and DIVI that I call “marketing campaigns”, it works very well except for a problem displaying CSS on the buttons.
Just so you know, we’ve set up several button types on Divi for the whole site we’re creating.

When creating a new “marketing campaigns” page, the page template is that of an article, which doesn’t work for me. So I created a new page template that really looks like a page and not an article. However, when I use DIVI and duplicate another page on my site, the buttons are broken. The rest of the page displays correctly.

Do you have any idea what’s wrong? It gives the impression that my CSS is overridden.