On any of my instances of the tree grid, when the scrollbar becomes prevalent, my trackpad triggers horizontal scrolling. Whether I’m scrolling up and down or left and right, the scrollbar jumps back and forth constantly. Ideally, I would have no trackpad. I wasn’t able to recreate this issue in a fiddle. Here is a gif. I am scrolling only right for a bit, and then scrolling left near the end.

I noticed in console log that scrolling triggered the GroupsRenderer method i have. I put a console log in there and scrolling causes the log to keep running. I wonder if this is related.
I am using latest Chrome on Sierra.
I will provide more information if requested.