I think that all the servers are affected, because, when the world is rolled back, our inventories aren't. I've had the experience before while owning my own server, and I am 99% sure that the player file (where the inventory data is stored), is dynamically updated every time someone throws, moves, or picks something up; due to this, players who build "something" of value gets rolled back, but in the inventory, the blocks used to build that "thing," are gone because of the world roll-back due to the fact that the inventories aren't rolled-back in synchronization with the world itself. I know that there is no known fix, but if there is, I hope that this server is one of the first to apply it.
