Weird jumpy behaviour

Hi there!

I have a Runkit notebook embedded in a web application here: https://mongoose-data-faker.herokuapp.com

Whenever the content of the notebook is so much that the height of the notebook somewhat exceeds the height of the browser viewport; clicking on the bottom section of the notebook makes the notebook auto-scroll down.
Don’t know if the description above fully explains the issue but I created a video here to better explain/demo the problem.

I don’t know why the auto-scroll is happening but I certainly do not want that behavior as it would most likely confuse users.
I have noticed this behavior on Chrome and Firefox, but not on Safari; is there a way to disable the auto-scrolling?

Thanks a lot.