Seems like Wild Elf / Wood Elf confusion.
Wild Elves are +2 Dexterity, –2 Intelligence.
Wood Elves are +2 Strength, +2 Dexterity, –2 Intelligence, –2 Constitution.
As far as I can tell, Grugach are meant to be Wild Elves, not Wood Elves; so shouldn't have received +2 Str / -2 Cha. Perhaps it's possible they were incorrectly marked and this was corrected?