Thanks 
Are you talking about the current version of Rich Markdown or Joplin?
Because for me the problem is present even without any plugin installed (without Rich Markdown).
There are two things I notice:
- Sometimes the note is not positioned at all in the right place, whether in the editor or the renderer.
- Sometimes it is positioned well in the renderer but not in the editor (this is where I have to move the text up or down on the renderer side so that the editor aligns it).