Text rearranges so its kerning appears slightly off when scrolling past the bottom of the page.
I find it more noticeable looking at the video than in this gif, but it’s still not a big deal.
Are you referring to the animated stretchiness of the text as you pull up from the bottom? Because I believe that’s just a responsive element of Google’s Material Design. I don’t see anything happening to the kerning itself, but then I’m on mobile, it’s a gif, and I’m tired.