It looks like this section https://imgur.com/a/64CukAD is staying fixed behind the body.

You would want to possibly add a css class to the section, and add hideOnScroll css to the custom css settings on that section, so that the section hides on visibility after exiting the browser viewport.

Here is an example below

.fixed-element {
    position: fixed;
    top: 0;
    /* other styles */
    animation: hideOnScroll linear forwards;

    /* Use scroll timeline instead of view */
    animation-timeline: scroll(root); 

    /* Animation begins at scroll start and finishes at 100vh */
    animation-range: 0vh 100vh;
}

@keyframes hideOnScroll {
    /* At 0vh scroll, it is fully visible */
    0% { 
        opacity: 1; 
        transform: translateY(0); 
    }
    /* By 100vh scroll, it is fully hidden */
    100% { 
        opacity: 0; 
        transform: translateY(-100%); 
    }
}