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I entered my name with chinese characters on the browser. but some of chinese characters of my name are broken when it displayes on the browser.

In this case,

If some letters of my name are broken, please write your name in English.
If some characters of my name are broken, please write your name in English.
If fonts of my name are broken, please write your name in English.

Which of above expressions are correct?
Comments  
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I don't understand why you have changed persons. These are correct:

If some letters of your name appear incorrectly, please write your name in English.
If some characters of your name appear incorrectly, please write your name in English.
If the fonts for your name appear incorrectly, please write your name in English.
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Hello,

you can say

"If some letters of my name are not shown correctly.."

Best Regards
Students: We have free audio pronunciation exercises.
Thank you for your answer.

If some letters of your name appear broken, please match with email address to confirm yourself on the list.

What about this?

I think that I made an example strangely.