4 men dungeon party error

i don't see the same thread as i see, i apologize if any thread same with me.. there's an error during my last dungeon in Amdepor Keep.. as i know, it's must be for 4 people.. but in my case it change to 6 people party can do the duty.. :confused:

this is the screen shoot that i hv..
https://p1n9yg.bn1.livefilestore.com...por.jpg?psid=1

sorry if the image too large

that's bug is coming after, one of my party get disconneted at the loading.. is someone hv same bug with me ?

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