The public can't view the "Item Details" for my story map. If a person clicks on the url, they are prompted to sign-in. The feature layer (hosted), web map, and web mapping application are shared with everyone. What do think is causing the problem?

[LesliRawlings]

URL to Item Details  story map: https://wscgis.maps.arcgis.com/home/item.html?id=d6e4e8e11d2d464d936bf77e2149cf8e 

Here is the link to the story map (everyone can access it):https://arcg.is/1eHWnb 

Could it be the group settings I used?  I created a group for my students to collaborate on this story map.  Although I have my group viewable to "Everyone," there might be a setting prohibiting the Item Details to be displayed. Any suggestions?  Or should I remove the story map access from the group, now that the map is finished?