Thank you for your suggestions,

I found it is indeed a font problem, the default font 'monospace normal' will produce the 'jumping' problem, and I have tried other fonts, like 'Microsoft YaHei normal', the 'jumping' problem disapeared.

Here are some examples that have the 'jumping' problem:
(你好)
你好(hello)
你好{}
你好[]

Here are some examples that are fine for both fonts:
hello(hello)
hello(你好)

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