It appears that once you change CSS properties that effect page layout, the effected elements can no longer be animated using GSAP.
I have an example here that is a simplified version of my project. Click on any of the colored rectangles to see what I'm describing. The first time you click, it transforms and scrolls to simulate zooming in on a rect. But since doing so also changes layout CSS properties - it breaks as soon as you start animating again in a peculiar way.
You won't be able to tell from the example why it is necessary to change layout properties, but it is something I need