They would have had to be punched out of the boards - did you receive two copies of one board, and are missing another board?
If the board was duplicated, you would have some islands with duplicate names too (not including the 4 corner ports)
That was the most mysterious part of it to me. None of the islands are duplicated, yet somehow those 4 crew members got duplicate prints on two different boards. As far as I can tell, I am just missing 4 crew members (with double abilities) that somehow got printed incorrectly.
It seems very strange to me, but I don't know the details of the printing/manufacturing process. There could be a reasonable explanation I suppose.
Regardless, I have contacted Red Raven Games and hope to have the matter corrected soon. Thanks for the information!