[Plugin: Markdown on Save Improved] Bug at Deactivated – Edit as HTML – Activated..

Found a bug when editing an article in markdown style (through this plugin) – if after editing post deactivate its plugin, then change the article in base editor and re-enable the its plug-in, we get the old version of the article.
Sorry for my english.
P.S. The frontend – coefficient displays the correct version in both cases.
http://wordpress.org/extend/plugins/markdown-on-save-improved/