Time: 12:47 AM PDT
Frequency: Once, though many others confirmed the same thing happening
World name: Hyperion
Character name: D'momo Pascal
NPC name: N/A
Monster name: Ghede Ti Malice
Class/Level: 50 PLD
Party or solo: Party
In-game time: Not sure
Area and coordinates: South Shroud, just south of Quarrymill
Steps:
1. Participated in hunt, encountered Elite A rank monster Ghede Ti Malice
2. Upon killing the elite monster I was credited with rewards twice. Screenshot of chat log:

http://i.imgur.com/2DZw3yf.png

Confirmed receiving 40 seals, 160 myth, and 80 soldiery from this.

Connection Specs
- Type of internet connection/provider: Wave Broadband 50 Mb/s