Can't pick up unique charm?

[past forge]

Farming keys, beastie dropped a unique charm. I can't pick it up?

[spark blade]

You have the charm already in your inventory cube or personal stash

[past forge]

Yeah, managed to finagle it through shared stash. You can only have ever one unique charm on person?

Is it like the vanilla gheeds?

[rare latch]

Every unique but Uber charms and sunder