Thank you Arthur!
I reviewed the story map and can definitely reproduce the issue, but am having trouble pinning it down.
If you go to My Stories and select the Story Map Cascade in question by clicking on its title, what do you see here? Does it say "No issues found" on the left? If not, can you grab a screencap of anything you see in this panel?
Thanks!
-- Rachel
Esri Support Services
Rachel Guttmacher
ArcGIS Online Technology Lead
Esri Support Services