I can't see anything in wikipedia's html that sets the font, usually websites set a font family for the page. So it sounds like on the odd occasion that websites don't, your default is 'odd'.
What do you see if you follow this:
OnePlus 5 review
Alice Saey's mesmerising animation for Dutch singer Mark Lotterman
iPad Pro 10.5in (2017) review
Comment booster votre iPhone ?