[Cerrado] Translations Not Saving in WPML Translation Editor

Background of the issue:
I am trying to translate content paragraph by paragraph in the WPML Translation Editor and have the translations saved correctly. The issue can be seen on this page: enlace oculto

Symptoms:
Some translations are not saved. Hovering over the segment temporarily shows the text, but as soon as I leave the segment, the translation disappears. After multiple attempts, only a few translations are saved.

Questions:
Why are some translations not saving in the WPML Translation Editor?
How can I ensure all translations are saved correctly as I move from one segment to the next?