Can you give the link to your post? Then i can try to figure out if something is not working correctly. Thanks!
Here:
https://scribbble.io/lawrence/laravel-cheat-sheet/
I am using Firefox.
I looked into it today. When you submit your article, the markdown will be cleaned up.
When not defining a language after the triple backtick, the backticks are not needed and the codeblock should be defined be preceding your code with 4 spaces or a tab according to the markdown specification.
So everything works as intended.
After publishing I tried to edit, but the "```" was replaced by "<!---->".