Yeah, I don't use torrents (for years now), but I remember from uTorrent that if the program exited abruptly, then a check had to be done. unRaid's default for stopping any container is 10 seconds. If it doesn't stop in that time, then it forcibly kills the container. The command is telling it to not forcibly kill for 60 seconds.
Due to a quirk though of dockerMan, you won't be able to restart the container via the GUI if you stop it that way. You'll have to
docker start deluge
If this fixes it, then I'll reissue my previously rejected PR that added a selectable timeout for stopping a container.