So far I've noticed that an @ comes out as a + or T on many sites (including AI). Also a ¥ (bullet) incorrectly renders as ?. Anybody else notice this. I've notified Apple via Bug report.
Check the charset for the site's HTML. I suspect they just have the wrong one set. It could be that Safari was more forgiving about interpreting charsets in the past.
Comments
See here as to why this is a complicated matter:
The Absolute Minimum Every Software Developer Absolutely, Positively Must Know About Unicode and Character Sets (No Excuses!)
You could post the URLs here too and we could check it out as well.