Languages: English (English )Italian (Italiano )Portuguese (Brazil) (Português )
Timezone: Europe/Rome (GMT+02:00)
this can depend for several reasons.
I see your default language is in Italian, so we can have various scenarios:
1. you write something in Italian then duplicate it -> for WPML the new string/page/post will be in English even if the content is still in Italian
2. you mistakenly wrote in Italian when you where in the English editor page
3. in WPML -> Theme and plugins localization you have "Assume that the original language of all strings is English" checked. In this case, even if hardcoded strings in your theme or plugins are in Italian, WPML will record them as being in English.
In all these cases, you should be able to translate strings and page without problems.
Let me know if this helps you or if you need further assistance.