我在回复某帖时发现LaTex代码

$$\color{brown}\boxed{\mathfrak\color{lightblue}\colorbox{brown}{Leave my name in front of the mountain}}$$

在预览框能渲染出来，但发出来就未渲染成LaTex，请问大佬们发生甚么事了？ \color{brown}\boxed{\mathfrak\color{lightblue}\colorbox{brown}{Leave my name in front of the mountain}}