Funny thing happened to me last night, when i was reforging/gemming with Zephyrus and it told me 7935 Mastery, 7934 Haste and 7933 Crit, but once i regemmed and all, turns out I now have 7935 Mastery and 7935 Haste, after 1 hour of testing on dummies it always goes for Mastery but leaves 1 haste