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As you can see, I only did invest two points in this skill tree, to get to rank 2 in the Baliistic Wepons perk. Nonetheless, the apprentice level perks have already unlocked (as is evident from the white rim around the symbols). This should not be possible, since the game tells you that at least four skill points have to be invested to unlock them. This could be the result of perks from other skill trees erroneously contributing to the combat tree.