@cindy647 -- Looks like there's an odd URL being used for one of your basemap layers. I've never seen that before and don't know how it happened, but can you try this...
- Change to another basemap
- Save the web map
- Switch back to the topo basemap
- Save again
Here's what is referenced in your map...
Here's what it should look like...
Owen Evans
Lead Product Engineer | StoryMaps