Hi,
could you please tell me what version/hotfix of Kentico
CMS you are using?
Have you customized the language selector web part or something else in the system?
Would it be possible to provide us a link to your web site so I could try to reproduce the issue. Unfortunately, in my environment switching between English and Chinese culture worked fine so I was not able to reproduce the issue.
Thank you in advance for information.
Best regards,
Ivana Tomanickova