if you have 2 agent serving the same queue and then send 2 task to that queue, each agent should take one task
But if you queue sequentially one task then wait until that task to finish and queue the next: then it will be random which agent will take the task. Can be the same on from the previous task
Are you saying that you have 1 agent running task, 1 agent sitting idle while there is a task waiting in the queue and no one is processing it ??