For me the first email address has the initial lowercase j seemingly normal; the second email address has the initial lowercase character that appears as j, except the below-the-line curly part doesn’t extend as far, and doesn’t upturn at all, unlike the first email’s j. This is on iOS 13. Curiously, if I copy and paste, both j’s look the same; they are formatted when pasted the same as the first initial j, which to me seems normal.