Losing 1200 ES when I use a life pot

Oddly enough, it happens to be my helmet. Im wearing this, I swapped it and it stopped happening. Idk whats wrong with it, but now I need a new helmet. lol I changed helmets to another Feathered Tiara. It didnt still persist. Ive kept the helmet in case you want to follow up.

Item Class: Helmets
Rarity: Rare
Beast Keep
Expert Feathered Tiara
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Quality: +20% (augmented)
Energy Shield: 291 (augmented)
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Requirements:
Level: 75
Int: 139
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Sockets: S
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Item Level: 79
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20% increased Armour, Evasion and Energy Shield (rune)
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120% increased Energy Shield
+26 to maximum Life
+11 to maximum Mana
22% increased Rarity of Items found
+40% to Fire Resistance
+9% to Lightning Resistance