What it seems to boil down to is that the result was reported, somehow a flag setting instruction by the server of successful transfer did not get set on the client and latter trying once more. Place to check is the result status page. Most probably the task sits there in Pending Validation or worst as Inconclusive awaiting a second opinion from another client, but it could be marked Valid already. I'd not spend time 'observing' for it might not happen again for a very long time.