If links on your translated page should redirect the user back to the default language, then the reason could be that the theme or an app is using hardcoded not-localized urls in its code. Therefore, you can contact with relevant theme developer or app developer for help.
The following article explains how links & URLs should be defined in the templates in order that they work with multiple languages 👇:
https://help.shopify.com/en/api/guides/multi-language#developing-themes-that-support-multiple-languages
All available links of the routes object 👇 :
https://help.shopify.com/en/themes/liquid/objects/routes
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