Hi Jessica,
Sorry you are seeing this issue. I just tested in the latest version of Safari (10.0.2) on my Mac (10.12.2) and do not see the issue you are experiencing. Are you able to update your browser and/or OS to see if that resolves the issue?
We also have a release coming out tonight and have fixed a few issues. If the browser/OS upgrade don't work or you're not able to do those, please try again tomorrow and let us know if you still see this.
BTW, excellent work on the story so far -- it looks great!
Owen
Owen Evans
Lead Product Engineer | StoryMaps