Can't Craft Opal Ring in Necropolis

Hi guys,

I buried two Opal Ring corpses with the same name in Necropolis already, but yet it gives the message "Crafting requires One or More Monster with the same name"

The corpses are not side by side. Does that matter?!

I am so confused! Any help is much appreciated! thank you!

here are the pictures

https://imgur.com/lxnpeHs


https://imgur.com/gQLELJ5