I will elaborate on the situation:
I have 2 agents - training and training_2. They are both listening to the services queue, but only 'training' pulls the tasks. At the beginning I had 2 tasks in the services queue. Then, agent 'training' pulled one and is currently executing it, but for some reason - it also pulled the 2nd task into it's queue, that is although this agent is not free and I have another agent which is: 'training_2'.