I've checked your translated product here hidden link and I can see the missing size.
Could you please edit the primary language product here? hidden link . Then, resave it and retranslate the product using the Advanced Translation Editor. Then, recheck and see if the missing attribute shows up.
I will need to closely examine your website. Therefore, I will require temporary access (WP-Admin and FTP) to a test site where the problem has been replicated, if possible. This will enable me to provide better assistance and determine if any configurations need to be modified.
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Thanks for your reply. I can see some configuration issues here for this product hidden link . I've edited the product and there is only one size attribute selected hidden link as shown in the attached screenshot. However, on the frontend, it shows multiple sizes. How did you add the sizes?