Hello @Saseju,
It seems that it is an issue with the gallery height which is creating an extra scroll on the small device just because the scrolling issue occurring. I would suggest you add this custom CSS code under the global CSS to get rid of the scrolling issue.
@media (min-width: 978.98px){
body {
overflow-y: hidden;
}
}
The purpose of providing custom CSS is to show you how to add CSS code to your site. Writing custom CSS is outside the scope of our theme support. If you need more customization, you need to learn CSS and learn how to use the browser’s element inspector or you subscribe to One where customization questions are answered.
Hope it helps.
Thanks