As the topic’s title says, upgrades for rings lower than the current I own are costing crests for upgrades.
I have a 665 ring, and when going to upgrade a 658 ring, it is going to cost me another 30 Gilded crests to upgrade this new ring.
I have put on two 665 Rings, shifted their slots, logged in and out, and it still requiring me to spend additional crests to upgrade this new ring, when I have already received and equipped rings of a higher ilvl.