I think the issue is that the font used by the author does not support fraction pixel sizing. I changed the body font size from 1.2em (16.8px) to 16px and the i

I think the issue is that the font used by the author does not support fraction pixel sizing. I changed the body font size from 1.2em (16.8px) to 16px and the issues are gone. I'm curious too as for why it happened. I'm guessing the font was originally designed for Japanese, not Latin. See: https://fontmeme.com/fonts/m-plus-rounded-1c-font/ https://fontmeme.com/fonts/m-plus-rounded-1c-font/