I'm an engineer on the Docs team at Stripe. Can you say more about where you're seeing the animation and what it looks like?
https://user-images.githubusercontent.com/128088/167891663-c...
Another small bug, the ::selection colour in CSS matches the yellow background on your homepage so if you select text there (in the 'Get started quickly' bit) you can't see what you've selected.
It looks like the "Try it out" is chasing the mouse, but perhaps someone tried to get a bit too fancy with it. Any mouse movement that is slightly irregular (speed, circular motion, etc.) makes for really wonky animations.