Glyph not present in the font, so browser substitutes some other. I assumed the page chooses the sample dynamically based on my location (see also: totally wron

Glyph not present in the font, so browser substitutes some other. I assumed the page chooses the sample dynamically based on my location (see also: totally wrong machine translation). If this is hardcoded, then it doesn’t speak well about the author that they wouldn’t notice it (and if shows lack of awareness of non-English, Latin alphabet using, languages). Practically speaking, of course, a full Unicode font is an enormous undertaking, hence so many fonts lacking diacritics other than Latin-1.