Error changing 170 gear to 180

Time: 01/28/2016 - 330AM ish
Frequency: once
World name: Leviathan
Character name: Mistykal Angel
Retainer name: N/A
NPC name: Seika
Monster name: N/A
Class/Level: Black Mage/60
Party or solo: Party but it was a solo transaction
In-game time: 330AMish
Area and coordinates: Idyllshire/x:6 y:7
Housing: N/A
Steps:
1. I bought a Raw Doman Urushi
2. I unequipped Yasha Ring of Casting
3. I went and spoke to Seiwa and handed the items over
4. The Raw Doman Urushi was gone from my inventory, item is still item lvl 170 and is still Yasha Ring of Casting

Connection Specs
- 100mpbs down something up TimeWarner
- ARRIS/DG1670

Model Number of the PlayStation®4 You Are Using
- Model Number: CUH-1001A