I think there's a bug with font-weight rendering. For the last few releases, I'm finding lots of text rendered as bold, regardless of CSS specified by the site, and without change when I edit in Inspector.
Weights render as normal, as defined and as expected in other browsers I've checked including Edge, Arc and Chrome.
Example: https://www.comedy.co.uk/live/news/8614/comics-comic-2025-winners/