Please try the following steps to resolve the issue:
1. Go to WPML → String Translation.
2. Search for the string “product-category”.
3. Delete the string from the String Translation table.
4. Go to Settings → Permalinks and click Save Changes to refresh your permalinks.
5. Navigate to WooCommerce Multilingual and re-add the translation for the product category.
6. If the category is already translated, try synchronizing your menu again.
Important: Please ensure you back up your database before making any changes.