Hi, Markdown editor developer here. I think this may be due to magic quotes being turned on, on your server, which are a remnant of old PHP. What version of PHP are you using?
Can you tell me EXACTLY what you submitted in the editor box, and what the exact result was? For example:
Also, make sure you are using the latest version of the plugin, here: https://github.com/svivian/q2a-markdown-editor
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