OK, I can see the story now. Not sure what happened before.
I don't see an issue in Safari, the map appears as expected for me. Once in a while, if I scroll very quickly through the story, the map doesn't load for a few seconds while the loading app up, but eventually it loads for me.
I'm using Safari 13.0.5 (14608.5.12) on MacSO Mojave 10.14.6.
Owen Evans
Lead Product Engineer | StoryMaps