Solved Difference between Divi builder and live page

Hello everyone,

I've seen several topics with similar issues, but none of the solutions mentioned worked for me.

Here is my problem:

When I'm on the Divi builder, the page looks different than in front/live page.

For example, if I create a page from scratch and add a line, by default the line (green) is supposed to be 80% maximum of the width of the parent section (blue). I don't understand why in the Divi builder, my line looks 100% width of the parent section. (see screenshot1).

Also, my footer is supposed to be black and horizontal, but i the Divi builder it appears white and vertical.

Third problem : the "+" button to ad module are not at the right place.

If I add some text, in the Divi builder they are one on top of another. (screenshot 2)

If I save the page, everything is correct in my live page (screenshot3)

I've disabled the "static CSS feature", and cleared all my caches. (screenshot4)

Any idea?