Allagan Stones of Aphorism - can't buy two rings

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Date & Time: 11:00 Pm, UTC+2
Frequency: Always
World name: Zodiarc
Character name: Hypsilon Deveon
Retainer name: N/A
NPC name: Cihanti
Monster name: N/A
Class/Level: Astrologian
Party or solo: N/A
In-game time: 9:00 PM, ST
Area and coordinates: Radz-at-Han; X:10.8 Y:10. 4
Housing: N/A
Steps:
1. Talk to Chanti and select "Allan Stones of Aphorism (DoM)"
2. Go to "Accesories" tab
3. Select "Moon ward Ring of Healing"
4. When trying to click on item, you will get message "Unable to complete exchange. You can only possess one of that item"

Explanation:
For the Allagaon Stones, the rings haven't been considered as an unique item so you could but two rings. But now, Aphorism rings are considered Unique, not only for healers.
For example, you can buy two rings of Augmented Scavian, Cryptlurker, Crystarium, Shire and etc.

Connection Specs
- Type of internet connection/provider: Fiber Optic, TET
- Modem maker/model number: Nokia, G-240W-B

■ PS4 Specs

Model Number of the PlayStation®4 You Are Using
- Model Number: CUH-7116B

Model Number of the PlayStation®Vita You Are Using
- Model Number: N/A

Information About the Peripherals You Are Using
-Type: N/A
-Maker: N/A
-Model Number: N/A

Not a bug. Tome rings always start off as Unique (can only have one per character) until they remove that property in the next expansion.