Double PC in dungeon Tam Tara Normal

Time: 21:48
Frequency: Once
World name: Adamantoise
Character name: Ardonis Ryedel
NPC name: None
Monster name: Galvanth the Dominator
Class/Level: Pugilist/26
Party or solo: Party 4(5?)
In-game time: ~9:45
Area and coordinates: Tam-Tara Deepcroft (6,7)
Steps:
1. Queued for Duty Roulette: Leveling and got Tam Tara Normal
2. Progressed through dungeon normally until final boss
3. As the fight was about to end I noticed there were two identical PCs (title, symbol and name) and there were five PCs in total (only four in the party hud)
4. I waited until everyone left the dungeon and when the double PC left both disappeared
5. The copy didn't seem to move at all since I took notice and until he left the dungeon

Connection Specs
- Type of internet connection/provider: Cable/TWC
- Modem maker/model number: ARRIS/TG862G