I don't get it what text are you talking about that changed?
The image doesn't show anything it looks the same unless you talking about the bolded parts like your username?
You can simply zoom in and out on that page if you want to make your fonts look big or small.
You can also use CTRL+scroll Wheel down or up to zoom in and out.
Op is not saying of font size or weight, I think he is talking about font style. There is actually a difference between the two images in terms of font style. The later font is looking like open sans.
Well, every browser has some default settings and fonts, and they are built in such a way that if the encoded fonts fail, the browser will work with the default fonts.
But it the case of brave browser, it blocks so many things and I believe part of which is the coded font style. You can manipulate this with script, but I feel it doesn't worth the stress as both fonts are almost alike.