We've just had 2x Apparitional Amice Fastener drop from the same raid. They dropped as a stack of 2 but the Link All command listed it only once in the chat. Pretty sure it's a bug. Please make them non-stackable so that they drop as 2 separate items. Thank you.
That has nothing to do with the issue. When you open the chest and click Link All, it links only 1 copy of the item. And they are actually stacked inside the chest. Your personal advanced loot settings don't affect the way they drop.
Our problem was we didn't want someone to loot 2 pairs of legs.. I agree these should be separate items. You don't see 3 ornamental robes stacking LOL.