Site restyling, one language does not duplicate media and form customizations

Hello. The site for many years was in Italian language (main language) and English language.

Recently the restyling was done, working on the Italian pages
https://trikego.com/it/

After that, I have been working on the new language, German, correctly duplicating the Italian pages that were to appear in the German version.

For the German language version, everything is fine: I duplicate from the Italian page and translate the necessary by manually inserting the texts. But if I do the same from the Italian page to the English page, the result is incomplete: missing images, videos and form customizations.

It happens ONLY by translating from Italian to English. As already written, translating from Italian to German the result is perfect!

To show you, I made an example with a new page 00 TEST ITA (staging site) https://staging35.trikego.com/it/00-test-ita/

Using the correct procedure
1. https://ibb.co/7Jk34Cc
2. https://ibb.co/kyWJbCX
3. https://ibb.co/jvXGy5v
the German page matches – duplicated all the content – but the English page does not! EMPTY :(

The German page is perfect, with everything, the same content as the Italian page. The English page is “empty” in the sense that it is missing the images and all the customizations that automatically duplicated correctly from Italian to German. But the English version is not correct

ITA https://staging35.trikego.com/en/00-test-en/
DE https://staging35.trikego.com/de/00-test-de/
EN https://staging35.trikego.com/en/00-test-en/

yet the path was identical.

Both pages were created using the same process, but the English page does not match. The German version matches, using “only” and “only” the standard procedure for duplicating and translating the page also described with images 1. 2. and 3.

This problem prevents me from proceeding, is there a solution?

As already written, the site was for many years only in Italian and English, the German version is new and works correctly: could this depend on this? I only hypothesize this because from Italian to German everything is fine, from Italian to English not.

Maybe one should actually -really- delete ALL ENGLISH LANGUAGE, including all references in the DB? How to do that? What to do? *__*

Please let me know if you could use the site in staging to do the checks or testing. Thank you.

Thank you for your time. Best regards. Bruno