@Peta_Williams, could you please forward a screencast to our support team so we can investigate this issue? I can’t seem to reproduce on my end, but this is definitely something we should look at.
In your video screencast, we recommend that you use a Chrome Incognito window and have your Javascript console open:
Try to include the entire browser window, including URL bar, in the video screencast. With that, our support team will be able to file a bug for our team to investigate 
Thank you so much for your help 