For a some months now we have problems with containers and entities not saving correctly on multiple servers. We have this problem since 1.8 but a chunkfix didn't find any corrupted chunks. If this bug accrues, all containers in one or multiple chunks get emptied on unload/save, and all entities get duped. It happens 1-2 times a week and really screws with the users, because they loose there items, and we as owner cant do anything against it.
(On the attachment the first 3 villagers are cloned multiple times and the chests are empty. Also there is a chunk border between villager 3 and 4, who didn't got cloned)