(Actually a dupe of another question but that was incorrectly closed so I’m posting here until the other question gets reopened, and this one merged.)
This has bugged me for ages. The website uses hyphens in negative numbers throughout. It should use the minus sign instead.
Of course it’s not important. It just looks really ugly.
The new reputation reporting tracker (thumbs up!) makes this particularly obvious:
Jin and waffles say on the other thread that for the SO font, the dash actually looks better than the minus sign but I think they made a mistake: They might have used the en-dash accidentally, which does indeed look even worse than the hyphen here.