In typography, Ligature binds two or more characters into one, which sometimes looks like an issue. Some Web browsers like Safari browser on both Mac OS X and iOS show standard ligatures by default.
If you have expanded or collapsed tracking (CSS: Letter-spacing) in the font you use, you will see that some letters are defined as one symbol:
I bet you’ll want to disable Ligatures—use the following custom CSS code for the entire website or just for a specific selector by a class name:
Learn more about ligatures issues described by Jason Tselentis, Associate Professor at Winthrop University’s Department of Design.