There was also a mysterious plague of missing hieroglyphs at the time of the New Kingdom (1550-1070 B.C.), when foreign influence made certain letters vanish from the language. Egyptian scribes valiantly tried to reinstate them by adding extra letters to the ends of words, which led to much confusion. And still does.
If you want to get ahead or give yourself a headache then Egypt is the place to be. Egyptian Gods go in for cumbersome and elaborate headgear, and tend to stroll around with animal heads. Usually without the matching body. Along the Nile there are only so many animals to go round. So they do have to share, which causes much confusion.