Ghost party member and Enemy npc

Time: January 15th around 2:00
Frequency: Once
World name: Behemoth
Character name:Brianna Blackburne
Retainer name:Sappphire Rokaa
NPC name:None
Monster name:Frostbitten Officer
Class/Level:Monk/60
Party or solo:Party
In-game time:N/A
Area and coordinates: Dusk Vigil
Housing:None
Steps:
1.We were fighting the enemies right before the second boss
2.All of a sudden I realized I couldn't attack an enemy, then saw that the tank was in two separate places at once.
3.They engaged in the boss fight while I explained the situation, and the two "Ghosts" were still locked in combat, and it was showing damage for both of them and the protect flashing.
4.I then requested for the tank to return after the fight so I could take a screencap of the incident for proof

Connection Specs
- Fiber optic/Mediacom
- Apple Time machine/N/A

Model Number of the PlayStation®4 You Are Using
- Model Number:CUH-1115A

http://i.imgur.com/Sg6Htkt.jpg -screen cap in question. Names are left shown so the moderator looking at this can properly see duplicates in question.