Lost Inventory Items for No Apparent Reason

[Yoona]

ISP: Rogers
Connection: Cable
Speed: 25 Mbit/s
Date & Time: Nov. 12 2013, around 8-9:30 PM EST
Frequency: Unknown
Character Name: Remilia Scarlet
Race: Hyur Female Midlander
World: Hyperion
Class: Leatherworker Lv50
Area: New Gridania
Party or Solo: Party, size 3
NPC: None
Monster: None
In-Game Time: Cannot remember
Steps:

1.I was just walking around, then I noticed I lost first 3 slots worth of items in Page 1 of my inventory. I did not make much of it.
2. I simply moved 3 items from another page to replace those 3 slots.
3. Later, I crafted a few HQ items and traded them to a friend.
4. I don't know whether or not the error occurred before or after that, but I had noticed I again lost 6 of my first slots in Page 1 of my inventory.
5. The first 3, then 6 slots in Page 1 of my inventory seems to have disappeared into the air.

Items lost: (Rough guess of how much at the time of loss)

Stack of Mulled Tea (~94x), Blue Cheese (~97x), Gysahl Greens (~96x), X-Potion (~15x) and X-Ethers (~15x), Grade 4 Carbonized Matter (~94x) and Cobalt Rivets (99x)

I made 100% certain to check all my storage areas. I did not discard any of those items nor consume them in battle/crafting during the short duration before I noticed I had lost quite a few items.