If Your Story Is Damaged
In some cases, a story might be visible in Twine but editing it shows things in a bad state: passages might be missing, put in odd locations, or have garbled text.
In some cases, solving this problem is as easy as quitting and re-opening app Twine or reloading browser Twine. When Twine first starts up, it checks your stories for possible problems and repairs them where it can.
But if restarting Twine doesn't help, you'll probably need to restore a backup version of your story.