Problem: You are trying to maintain a consistent URL structure between your main site and the translated version using WPML. On your main site, the URL is site.com/watch-straps/nato, but on the translated site, it changes to site.com/sv/produkt-kategori/klockarmband/nato-sv/. Solution: This issue is recognized as a known problem related to the Rank Math SEO plugin where turning on 'Strip Category Base' causes issues with secondary languages. We are currently working on a fix for this. In the meantime, we recommend not translating the category, product, or product-category slugs. The untranslated terms won’t be visible in the URL anyway when you use any of those options. For more details, please check the known issue here: Rank Math SEO and WPML URL structure issue.
If this solution does not apply to your case, or if it seems outdated, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have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. If you still need assistance, please open a new support ticket at WPML support forum.
