Huh, very weird. If I download the favicon for that site, open it with Pillow, and save it, I get that weird shifted result. Must be a bug in Pillow, I've registered an issue there: https://github.com/python-pillow/Pillow/issues/3403
I don't think there's anything I can do on this end other than hope for an update to Pillow though (or replace that image manually), so I'll leave it for now unless it seems to be more widespread.
closed