mathJax can't working at question page

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I enable the MathJax and it words very well in the question-asking page , it can preview the rendering math picture. But it can not work at the question page, it presents the original characters.

MathJax enbale link: askbot.org/en/question/2584/does-math-like-f-x-e-x-work-on-askbot/ askbot.org/en/question/6769/best-way-to-customize-the-mathjax-settings-in-askbot/ askbot.org/en/question/6760/how-to-enable-mathjax-on-the-hosted-by-askbotcom-website/