[Закрытые] Why so many products and strings are not translated?

Background of the issue:
I am trying to translate all products with the Brand: 'ActiveGym' from Bulgarian to Romanian and Greek using the AI automatic translation. After finishing, I noticed many product specifications remain untranslated. Here are some examples: Press the button "Additional information" = "Επιπλέον πληροφορίες" and you will see the problem. The issue can be seen on this page: скрытая ссылка. Screenshots of the problems are available here: скрытая ссылка, скрытая ссылка, скрытая ссылка, скрытая ссылка, скрытая ссылка, скрытая ссылка, скрытая ссылка.

Symptoms:
Many strings and product specifications are not translated. When I press 'Product specification' - 'Επιπλέον πληροφορίες', sometimes everything is in Bulgarian instead of Greek. This issue also occurs with English and Romanian translations. I can't translate them manually because WPML doesn't provide that option.

Questions:
Why are so many products and strings not translated?
How can I ensure all product specifications are translated to the selected language?