For what it's worth ... ScrollMagic is a bit unnecessary here (unless the CodePen isn't displaying the entirety of the project). This could be handled with a simple paused timeline where the current scroll position progresses the Timeline. Also, using some X positions rather than "left" could help. Lastly, I'm a fan of using background images on divs and moving the divs (using X/Y) rather than moving the backgrounds because of the hardware acceleration.   Here is a quick codepen taking
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