Scrolling Presentation problem

Hi, on my page https://vividghost.com I have set up the first presentation slide’s secondary button (‘Find out more’) to scroll to second slide. On the second slide I’ve set the secondary button (‘How it works’) set to scroll to third presentation slide. However, instead of it scrolling to the third slide straight away, it looks like the page jumps up to the first slide then down to the third.
Is there anything I can do about this please?
Thanks