Game says my pair of (uncorrupted) Lochtonial Caress gloves can only have 3 sockets max.

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Item Class: Gloves
Rarity: Unique
Lochtonial Caress
Iron Gauntlets
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Quality: +3% (augmented)
Armour: 8 (augmented)
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Sockets: B R-R
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Item Level: 23
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15% increased Attack Speed
14% increased Cast Speed
+20 to maximum Life
11% reduced maximum Mana
10% chance to gain a Power, Frenzy or Endurance Charge on Kill
Conduit
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Why cling to your sanity? It offers you nothing.
Surrender to me, and I will grant you everything.