Hi,
The "multiple versions of prosemirror-model were loaded" error indicates a site-side problem where conflicting versions of the text editor are being loaded. When that happens, the rich text box can’t process input correctly, causing text to vanish or fail to display. Switching to "View Markdown" works because it bypasses those buggy scripts. Since the problem comes and goes, it’s likely related to cached updates or deployment changes, so for now, continuing to use Markdown mode is the most stable workaround.
Kind regards,