Happy to help!
To make the warnings go away, scroll down to lines 49-50 in the graph. There were two copies of O_n=1, and you can delete the second one (result shown).
Can you describe what is not working about the correctness? What I am seeing for the dashboard preview right now matches my expectations.
To hide “Here are your results…” from students, you could just delete the note. If you want to keep the note around just in case, you could also go into the script and change the last line of the script to hidden: true