It seems that WMD-Editor is posting HTML to the server instead of the markdown. How can i get it to send the Markdown?
In the master branch of the SO version, the interesting line is line 2341:
Attacklab.wmd_defaults = {version:1, output:"HTML", lineLength:40, delayLoad:false};
Change this to ask for markdown instead:
Attacklab.wmd_defaults = {version:1, output:"markdown", lineLength:40, delayLoad:false};
.. and you'll get the Markdown instead.