Noticed the same with my Hunter.
My Warlock has Claws of Ahamkara (same perk, 2nd melee charge) & with the Stormcaller when I use the melee he uses both hands when I have 2 melee charges & when I have 1 charge he uses 1 hand lol
English
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In that case, warlocks will only use two hands if their melee is charged and there is an enemy within range of the attack. Otherwise he will just use one hand and then melee charge comes back immediately bc nothing was hit
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I thought that had to do with range. Longer range= both hands, short range or no enemies= one hand