Items conflict

Hello!

I have a strange situation: Anyone know why i cannot use both this items? Every single socketable inside it is different by the others... i don't understand...

The game let me to equip without problem the gloves OR the belt, but when i try to equip both, the game deactive the belt, even if no rune is duplicated.

My lvl is 97.

https://imgur.com/a/items-conflict-ic7c1Kf

Gloves: Jiquani's Thesis (Limited to: 1 Ancient Augment)
Belt: Kurgal's Gaze (Limited to: 1 Ancient Augment)