Swarm Agent at 99%

Hi, i render with 3 other machines. Can you explain me this behavior please? (Picture Link)

Hi , same problem here, UE 4.18.3 , I already made my lightning in preview and medium quality , then i went for the production value: got 6 machines working at swarm, 5 finish their tasks in about 4 hours or so , the last one, which is the coordinator , stuck at 99,81 % . I waited for 3 more hours and did not move at all… .
Got to pull off the lightning build , lost 8 hours of pc workload. I could not found any reason for this.