As this happened after the software update it’s most likely a software issue and easily fixed. It looks like a calibration miscalculation on that one leg.Loona keeps doing the same thing after yesterday's update.
She doesn't listen to commands. She keeps turning upside down like in the video.
What should I do?
The only other thing it might be is a cracked potentiometer mount or cracked position sensor. The sensor might be unable to calculate the correct position reading for that leg if it’s cracked.
You used to be able to recalibrate Loona using the app. I’m currently at work but will have a look in the app when I get home to see if I can find the calibration fix in the app and reply here later today.