Issue with language suffix and language switcher

This is a Drupal 7 site. The multilingual and translation work perfectly previously. However suddenly i realize when i change language using the language switcher, the content does not switch.

For example, I have this node:
When i switch to Chinese, the URL supposed to change to
However the URL remain as en version.

On front page, the language switcher works very well. When i am at, then i use the language switcher change to Chinese, then
The language switcher does not work with node URL.

Basically I have tried every possible, but no luck at all.

Anyone know what is the reason behind? Really appreciate if someone can give suggestions.

Drupal version: 


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