Modified skinnable creature tooltip; this creature requires 150 Skinning to skin, but the player doesn't have Skinning, so it doesn't show his current Skinning level.
Modified mining node tooltip; this node requires 375 Mining to mine, and the player can mine it, so his current level is not shown.
Modified herb tooltip; this herb requires 150 Herbalism to pick, and the player can pick it, so his current level is not shown.
Modified mining node tooltip; this node requires 400 Mining to mine, but the player isn't that high yet, so his current level, as well as any temporary boosts, are shown.