Okay, my Swashbuckler, has both the Dutchman's Garnet and the Shrimpy Garnet, both come with Weapon Mastery +5%. When you look at them in the talents section it shows both combined, but with only +9%. Same for my Musketeer, his also says only +9%.
Now, my Witchdoctor, now has the Moo Manchu Staff of Power, which gives him a Base will increase of +5 and Mojo Mastery +5%! He also has the Dutchman's Sapphire and Shrimpy Sapphire that also give Mojo Mastery +5%, but when you check the Talents Page, it shows all 3, but only increase of 12%??? Is this a display issue or an actual bug?