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Problem:
If you're experiencing issues with missing language folders in the URLs for certain subcategories on your multilingual online store, such as missing /ru/ for Russian and /es/ for Spanish in subcategory URLs.
Solution:
We recommend first ensuring that you have a complete backup of your site. Then, try disabling all non-WPML plugins and switch to one of the default themes to check if the issue persists. This step helps identify if there's a conflict with other plugins or themes. Additionally, navigate to Settings -> Permalinks in your WordPress dashboard and save the permalink settings again, as this can sometimes resolve URL issues.

If these steps do not resolve the problem, or if the solution provided here becomes outdated or does not apply to your specific case, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. Should the issue persist, please do not hesitate to open a new support ticket with us for further assistance at WPML support forum.