If you click the bubbles multiple times (as done the first time in the video), then Nessie appears as normal, and then appears an additional time a few seconds later, instead of new bubbles appearing. If you click the bubbles a single time (as done the second time in the video), Nessie appears once, and new bubbles correctly appear a few seconds later.
https://youtu.be/dfoISplDytE
If you click the bubbles multiple times (as done the first time in the video), then Nessie appears as normal, and then appears an additional time a few seconds later, instead of new bubbles appearing. If you click the bubbles a single time (as done the second time in the video), Nessie appears once, and new bubbles correctly appear a few seconds later.