[Решено] Duplicated menu item on a specific language

Background of the issue:
We have a duplicated menu item on the RO language, that we cannot control. I've followed the documentation, but the item does not appear in the original menu or the string translation. The site in question is скрытая ссылка and the specific page is скрытая ссылка. I am following the documentation at https://wpml.org/documentation/getting-started-guide/translating-menus/.

Symptoms:
Duplicated menu item on the RO language that does not appear in the original menu or the string translation.

Questions:
How can I remove the duplicated menu item on the RO language?
Why does the duplicated menu item not appear in the original menu or the string translation?