I have been working for days on a story map. I have 3 tabs with 22 locations and their associated thumbnails and text descriptions. Suddenly 2 out of my 3 tabs were empty. The "My Story" page still listed all 22 and it still had the thumbnail titles and links for my images, all of which loaded the correct images when I clicked on them. I took a screenshot of that page and closed it. When I re-opened the story maps website and navigated back to "My Story" it showed that I had 8 locations. All the rest of my locations and associated content are now gone. At no point did I go into any other tab and delete content. When the deletions in tabs 2 and 3 occurred, I was working in tab 1.