I looked at it on my iPad and didn't notice anything odd at all. But beware that it's normal to see a very slight jump at the exact moment pinning occurs if you're scrolling quickly and that isn't a bug at all with ScrollTrigger - it's just the nature of how browsers handle things. They do scrolling of the main document on a DIFFERENT thread (not synchronized with the main thread), so it sometimes paints the scrolled position for a brief moment before it fires the JavaScript that does the pinnin