I know perfectly what you mean. But this happens on a regular basis with your swift editor and it’s the first time that happened in the theme options for me.
I can recreate it (when it starts happening – usually when there’s a slow server response time – slow page load).
Admin:
1. Edit existing page
2. Page opens in the default wp editor (so you see your framework’s shortcodes)
3. You switch to Swift Editor and all the content is gone.
– If you save again by mistake you have to dig through revisions to get everything back.
– otherwise a page refresh is enough
– when this happened in the theme options …you can imagine what was left…