[Resuelto] WPML is only translating titles

Background of the issue:
I am trying to translate my original article in French, which is mostly HTML, using WPML. The article can be found at: enlace oculto. I attempted to translate it by screen or by XLIFF.

Symptoms:
When I try to translate the article, it only translates the titles. Instead of seeing all the content translated, I get a series of elements that only include titles and headings.

Questions:
Why is WPML only translating the titles and not the entire content of my article?
How can I ensure that all content, not just titles, is translated using WPML?