Yep, seen this happen to a few people. I usually try and avoid doing too much work inside of the submit a story window. I am even getting to the point now I just start adding in my centers, and other markdowns as I write thing out outside of steemit. Including even putting an image into Steemit window for a url and then cutting it out and into the post I’m working on. Long term, hoping that saves me time from having to try and edit inside of Steemit.