403 Forbidden when editing my own posts

Hey, I’ve just try to editing my own post, or message in discourse as a low privilege user, It will show a popup message with content:( 403 Forbidden) as shown in the image below, Even when I change a word or character. Is discourse have a time limit for editing?

more info:
The same thing occurs when you add some line of php or javascript code to any post or message

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