I'm not able to reproduce your problem. Can you try with more simple steps or with another browser? What else widgets and layouts do you have on this page? What template are you using for this page?
I tried to reproduce the issue you describe in your latest post, but was unable to do so. I followed the exact procedure from the video you posted. I was using our latest internal build.
I tested with admin account. What is the role of the account you are testing with? Do you still reproduce it after restarting the application?