Developer Js + Greensock (GSAP) to finalize a project

I am creating a [login to view URL] is developed with greensock js html css. the scroll is exactly like the one in this link([login to view URL]).The scroll stops and start manual scrolling with content and parallax images, after the 4th slide. the project is at the [login to view URL] i have important bugs that i must fix 1)the scrolling at ipad(touch devices) is not ok after the 4th slide.(you must have ipad to test the project if its ok) 2)the parallax has a bug only at chrome at [login to view URL] not playing well(i think is a problem with the background-property:fixed) but i cant fix it. i want somebody to know very well greensock to do it correct and quick