Sorry I was referring to someone joining after the DZ had been started, that may have had a loot lockout and tainted the raid. I know the raid leader that started this DZ would have not done so with a loot lockout prompt. My earlier question was whether once the DZ was opened, if someone that joined after that point in time, carrying their own loot lockout, could then quietly taint the raid for everyone else? If so, that should be changed. If not, then I have no idea what could have taken place other than a blatant bug.
Possibly, considering the mob being spawned is when it would check for the loot lockout. It may have ran into that person with the lockout as it checked and said nope, no bueno. No loot. Good possibility to bring up with an answer I don't know, never ran into that or considered it that way.