Double braces render text in fixed-width font.
If these text contains braces the renderer comes despite Escaping out of step.

F.E.:

${p}

Here's the closing bracket not in the box.

Source Code:

{{$\{p\}}}

The first and last two braces are not escaped , because they instruct the formatting . The two braces that enclose the "p" are escaped , because they will be presented .