What is causing auto-scroll here?

Hi all,

I have found this example of a multi-step form all on one page. You can open it in Webflow read-only here.

When you click on a form button, the website automatically scrolls to the next section. Doing developer tools > inspect reveals that only the current section is displayed, and the others have a “display: none” style.

However, I can’t find what is causing this behaviour. I couldn’t find any form elements that have links to other page sections or elements with interactions. When I add a new section in between questions 2 and 3, I can’t get the same auto-scroll effect and it is displayed no matter what.

What is going on?

I would really like to replicate this effect for my own project so any help is much appreciated.