[Resuelto] WPML menus all languages appear under the main language.

Background of the issue:
I have made a copy of a website and all the language menus are messed up and under the main language. enlace oculto

Symptoms:
All menus are showing with the same name duplicated instead of only two menus in each language.

Questions:
Why are all language menus appearing under the main language?
How can I fix the duplicated menu names issue?