Markdown issues with spoilers and backslash breaks

The issue can be seen here, in the section where I'm talking about spoilers.

When using backslash breaks while describing the Markdown syntax for spoilers, I noticed that Jerboa has some difficulties handling the rendering.

In my text I wrote

\:\:\: spoiler **warning! spoiler!**  
the butler did it  
\:\:\:

but Jerboa rendered as if it was

::: spoiler - warning! spoiler!
the butler did it :::

If the same post is accessed by browser, it's rendered correctly so I don't think it's a syntax error