I've fixed it [1] after confirming [2] (yet again just now; I've ran those numbers many many times so I'm very confident it's not a one time fluke).
Thanks for catching it. You're also welcome to try to confirm the results yourself, they should be reproducible!
[1] https://github.com/gopherjs/gopherjs.github.io/commit/acea7a...
[2] https://gist.github.com/shurcooL/02183a57c51b28eaadf4