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That's because they are actually invisible buffs (no icon), and they used the same buff on both items. Since you can't have the same buff twice, the +skill does not stack.So +5 on gloves doesn't stack with +5 fishing line. +10 on boots doesn't stack with +10 on Nat's Hat or something.
(they used invisible buffs because they did not implement +skill on gear, so they had to make a kludge for the very few items with +skill, like mining picks and herb gloves)