Not getting credit for RoE Lair reives when in party

[dasva]

Platform: PC
ISP: Comcast
Type of Internet Connection: cable
Internet Connection Speed: 50Mbps
Date & Time: 19 dec 2013 ~6 pm
Frequency: Every try
Character Name: Dasva
Race: Taru
World: Bahamut
Area and Coordinates: ceizak battlegrounds
Party or Solo: Party
Monster Name: None

step 1: Accept Lair reives: Ceizak battlegrounds

Step 2: Defeat a Lair reive in Ceizak battlegrounds while in pt.

Step 3: Only 1 person in party each time gets credit for it. It appears to be the person who got the last hit in

Step 4: repeat steps 1-3 but this time another random person joins in on the reive and NO ONE in the pt gets credit