I experienced this issue today in the latest version of ArcGIS Online. Your suggested solution of turning off all the sharing settings for the map and all layers within it worked for me. However, you said that the bug was fixed in version 7.1, and the current version as of today is 8.4. Could this be a new bug with repeat behavior?
Best,
Katie
“The goal is not simply to ‘work hard, play hard.’ The goal is to make our work and our play indistinguishable.”
- Simon Sinek