[Resolved] The default English language override the secondary Chinese Language

Background of the issue:
I am trying to: The default English language override the secondary Chinese Language (Describe what you were attempting when the issue occurred). Link to a page where the issue can be seen: hidden link

Symptoms:
The Chinese content of the default English page should have Chinese words. Instead, the default English content was copied to its Chinese content again, and all Chinese words were lost.

Questions:
Why is the default English content overriding the Chinese content?
How can I ensure that the Chinese content is preserved and not replaced by the English content?