Problem:
When logged into the backend and viewing the front-end in a different browser tab, switching from the default language to another language and using an AJAX filter on a custom post type page results in displaying results from the default language instead of the selected language. This issue only occurs when logged in and is visible on the page with the AJAX filter, as two language cookies appear: one for the backend and one for the front-end, with the front-end cookie incorrectly switching to the admin language.
Solution:
First, confirm if the option "Store a language cookie to support language filtering for AJAX" is enabled in WPML → Languages. You can find more information about this setting here.
Next, check if the issue persists when all non-WPML related plugins are temporarily disabled. This helps determine if there's a conflict with other plugins.
If the problem continues, it may be due to compatibility issues between your custom code and WPML. While we cannot debug custom solutions directly, you can refer to our documentation on debugging theme compatibility here and the WPML Hooks Reference API here for guidance.
We also recommend testing this issue on an alternative server or local installation to rule out server settings as the cause. Additionally, keep an eye out for the upcoming beta version of WPML 4.6.10 and consider testing it.
If the solution provided here is not relevant to your case, either because it's outdated or not applicable, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and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 do not hesitate to open a new support ticket in our forum.
