Hi there,
This happens because in eServices the interaction is being held for a limited amount of time in the RAM of the IXN Server. Most of the time, for queued interactions, they are being held in the IXN Server DB and the queue will be the Interaction Queue that triggered the strategy.
So you won't have an agent until it is distributed from the queue (to an agent or to other Interaction Queue / Workbin, which will be counted as "Distributed Other").
Regards,
Andrei