How did you create the PDF? Sounds a bit like the ff is a ligature (i.e. not simply two f’s, but like one special character consisting of two f’s) https://en.m

How did you create the PDF? Sounds a bit like the ff is a ligature (i.e. not simply two f’s, but like one special character consisting of two f’s) https://en.m.wikipedia.org/wiki/Ligature_(writing) https://en.m.wikipedia.org/wiki/Ligature_(writing)