This has more to do with how Moodle handles alternative text formats like moodle format are markdown.

The html editor automatically assumes that all texts are written in html format. This produces strange results when you have written a text in markdown and open it with the html editor.



Don't know of a solution. Of course there is no easy way to convert html back to markdown format. I still would be happy even if the conversion would be one way only: use the html editor once on a markdown text and it will be html afterwards for always.



other solution: never open the html editor when format is other than html format.