Hmmm that's incredibly frustrating. I'm trying to reproduce this but failing. Are you able to do this every time? If so is there any chance you could take a screen recording please to help us debug it?
First I have to apologize. I hadn't upgraded chrome. After updating it did not happen again on chrome. It does happen on firefox[0], and I do realize that you've stated your app works best in chrome.
Lastly, thanks for making this. It looks really cool.