If you have english as your default language, and from it, you create two menu items:
1 - Home -> cms page home
2 - Contact -> cms page contact
And then you translate the titles to spanish:
1 - Inicio
2 - Contacto
And then, from english you reorder them like this:
1 - Contact
2 - Home
the translated titles stay with the same order, so they don't match anymore with where they are pointing:
1 - Inicio (pointing to contact)
2 - Contacto (pointing to home)
The same happens on the other way around (if you reorder the links from Spanish, the titles get messed up in English)
