Item not found but...

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Date & Time: 6:02PM Jun, 6 (UTC -3)
Frequency: Once
World name: Lamia
Character name: Seiji Kyoshiro
Class/Level: Black Mage
Party or solo: Solo
Area and coordinates: Shirogane X11 Y13
Steps:
1. Just log in the game and was to change to blm
2. Receive a message Diamind Rod was not found, my heart jump because even if disacard by accident, one time recovery was used.
3.I realized I changed my melds yesterday and the game probably identify it as a different weapon, still I think is a bug.
3. Realized Diamond rod was in my weapon inventory
4. I dont update gear set after changing melds

https://i.imgur.com/meDKxvq.png
https://i.imgur.com/KsaloTB.jpg