[Chiuso] variation drop menu does not show

Background of the issue:
I am trying to resolve an issue where the variation drop menu has disappeared on my WordPress site. I have attempted several troubleshooting steps, including deactivating/reactivating plugins, updating, changing the theme, removing unused plugins, repairing the database, and checking for solutions to errors. The problem occurs in the default language, which is Arabic, while the English version is fine. The issue can be seen on this page: link nascosto. I expected to see the page in English: link nascosto, but instead, I got the Arabic version: link nascosto.

Symptoms:
The variation drop menu does not show in the default language (Arabic), but it works fine in the English version.

Questions:
Why is the variation drop menu not showing in the default language?
What additional steps can I take to resolve this issue?