Completed Twin Adder Quest Unable to Complete

Time: 1:01pm
Frequency: Once
World name: Midgardsormr
Character name: Sha Kuro
NPC name: Vorsaile Heuloix
Monster name: n/a
Class/Level: BLM/50
Party or solo: Solo
In-game time: 1:01pm
Area and coordinates: New Gridania (9,11)
Steps:
1. I've completed Twin Adder Quests to the end of Shadows Uncast as well as completing the main storyline and the Twin Adder hunting logs 1 and 2.
2. I talk to Vorsaile Heuloix (whom has a green check over his head) and after talking, "Quest Completed" shows on screen but the check never disappears and I can repeat step 2.

Connection Specs
Internet Provider: Atlantic Broadband
Cable Modem Company: ARRIS
Cable Modem Model: TM822G
PlayStation 3 Model: CECHL01

Thank you for your time, I've heard others are having this problem on my server and I hope my post can be of help.

After being offline since last night, this glitched fixed on it's own. Since the glitch, I changed classes from 50 BLM to 26 CNJ, did 4 Twin Adder levequests in East Shroud, switched back and decided to attempt completing the quest again and it worked.

Thank you for posting your concerns about this issue. I have made sure to submit all of your information to the development team and they will thoroughly investigate this matter, based on your report. Unfortunately, I cannot guarantee that a direct response will be posted on this thread, but I do recommend checking Here or Here for any details regarding the development team's investigation. Thanks again for your report!