@julian Thank you for your answer, and yes, that could be where the problem comes from.
I have these plugins on : default composer, alignment, markdown, simple spoiler.
PS. But I don't have the "redactor plugin" if by that you mean a wysiwyg editor.
I am in beijing, and I can't access nodebb website or community without shadowsocks, I think maybe the China GFW block it. If nodebb need more people to use it. This problem should be solved, maybe build a mirror website?
