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

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