Hi,
Interesting, I see what you are saying. I did a test and had the same outcome in terms that the output from the formula only left the values after clicking "Look for new submissions".
I know that the doctopus code has not been modified but am curious why this is a new behavior. I will touch base with a developer to get more answers.
In the meantime I would work around the issue by perhaps only imputing the formula after all submissions have been received or placing the formula on a new tab.
Thank you for highlighting this, I will keep you posted on what I find!