Shadows Uncast bug for Grand Company Quest (Immortal Flames)

Time: 4:00 am CST
Frequency: Always
World name: Excalibur
Character name: Asael Drakengard
NPC name:Swift (Flame Commander)
Monster name: N/A
Class/Level: PLD/GLA 50
Party or solo: Solo
In-game time: Night
Area and coordinates: Ul'dah Steps of Nald X:8 Y:8

Steps:
1. Accepted quest "Shadows Uncast" for Immortal Flames Grand Company from Swift.
2. Completed Dzemael Darkhold through Duty Finder
3. Turn in quest to Swift
4. Upon turning in the quest to Swift the "Quest Completed" prompt will appear normally (experience and Flames Seals are NOT awarded).
5. Although it never registers in game that the quest has been completed. Thus you are left to turn in the quest repeatedly.

Connection Specs
- Type of internet connection/provider: Fios/Verizon
- Modem maker/model number: Verizon Modem/ Model number unknown

PC Specs
-=-=-=-=- System Information -=-=-=-=-
Manufacturer: Cyberpower Inc.
Processor: AMD Phenom (tm) II X6 1055T 2.80 GHz
RAM: 4.0 GB
System type: 64-bit Operating System
Video Card: Nvidia GeForce GTX 580
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

Browser Information
- Name and version of the browser currently in-use: Firefox 12.0

Update:

Okay if anyone else is having this problem or elsewhere the solution is to be sure you have at least one empty space in your inventory. Upon receipt, Flame Seals are initially counted as an actual item, and they must have an inventory space to drop in before they can transfer into normal Flame Seals. Upon clearing up some space in my inventory I was able to turn in the quest and have it register as being complete.