Both. I don't recall if this is necessary to cause it to start happening, but as soon as you pinch any amount with two fingers for zooming in/out (or to scroll

Both. I don't recall if this is necessary to cause it to start happening, but as soon as you pinch any amount with two fingers for zooming in/out (or to scroll down to see the rest of the cut off UI), the behavior sticks around for a while. I'm not entirely convinced that this is anything on your end, as I have run into similar issues with my sites, and all the "answers" online don't really fix it. I believe the only real solution is some combination of setting viewport, disabling certain scrolling/finger gestures*, and ensuring that the content on screen doesn't go off the page. I'm no expert though. *: I don't recall this being absolutely necessary, and it is generally not recommended for accessibility reasons. I believe that I mostly fixed it with just setting the proper viewport meta tag and ensuring content doesn't go off the screen.